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+\documentclass{standalone}
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+\usepackage{pgfplots}
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+\usepackage{sansmath} % for sans serif math
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+
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+%%%<
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+% The data files, written on the first run.
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+\begin{filecontents}{function.data}
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+# x y
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+0 0
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+0 1
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+1 0
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+0 2
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+1 1
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+2 0
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+0 3
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+1 2
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+2 1
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+3 0
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+0 4
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+1 3
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+2 2
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+3 1
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+4 0
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+\end{filecontents}
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+
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+\begin{document}
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+
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+\begin{tikzpicture}
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+\begin{axis}[
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+ compat=newest, % for better label placement
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+ font=\sansmath\sffamily, % math and normal text in sans serif
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+ xlabel=$y$, ylabel=$x$, % the label texts
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+ xmin=0, ymin=0, % axis origin
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+ enlarge y limits=false, % don't enlarge the y axis beyond the data range
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+ enlarge x limits={upper,abs=0.02}, % enlarge x axis slightly to make sure the last tick mark is drawn completely
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+ axis lines*=left, % only draw the left axis lines, not a box
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+ unit vector ratio*={1 1 1}, % equal axis scaling. "*" to make sure the axes can only be reduced in size, not enlarged
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+ width=6cm, % set the overall width of the plot
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+ try min ticks=5, % adjusts how many ticks are printed
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+ tick align=center, % tick marks centered on the axes
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+ legend style={
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+ draw=none, % no frame around axes
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+ at={(1,1)}, % place at upper right of plot
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+ anchor=north, % use upper middle edge of legend for alignment
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+ fill=none
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+ },
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+]
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+\addplot [
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+ mark=square*, mark size=0.5em, % square, filled ("*"), radius of 0.5em
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+ nodes near coords={
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+ \pgfmathparse{int(\coordindex)}
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+ \pgfmathresult
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+ }, % print labels on each data point, using `\coordindex` (the data point counter) increased by 1
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+ every node near coord/.style={
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+ font=\scriptsize\sffamily\bfseries, % smaller text size, bold for the data point labels
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+ text=white,
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+ anchor=center % center the labels on the plot marks
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+ }
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+ ] table {function.data};
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+\addlegendentry{$\displaystyle\pi(x, y) = y + \sum_{i=0}^{x+y} i$}
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+\end{axis}
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+\end{tikzpicture}
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+\end{document}
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