%% 
%%  A DANTE-Edition example
%% 
%%  Beispiel 02-14-4 auf Seite 76.
%% 
%%  Copyright (C) 2010 H. Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

%%Run also: >>  << 
% Show page(s) 1

\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{355.65944pt}
\setlength\parindent{0pt}

\usepackage{spreadtab,amsmath}

\begin{document}
$\begin{spreadtab}{{matrix}{}}
1\\
[0,-1] & [-1,-1]\\
[0,-1] & [-1,-1]+[0,-1] & [-1,-1]\\
[0,-1] & [-1,-1]+[0,-1] & [-1,-1]+[0,-1] & [-1,-1]\\
[0,-1] & [-1,-1]+[0,-1] & [-1,-1]+[0,-1] & [-1,-1]+[0,-1] & [-1,-1]\\
[0,-1] & [-1,-1]+[0,-1] & [-1,-1]+[0,-1] & [-1,-1]+[0,-1] & [-1,-1]+[0,-1] & [-1,-1]
\end{spreadtab}$
\end{document}