il problema di fondo che questa tabella DEVE avere linee verticali e linee oblique
ecco il mostro
`
\documentclass[12pt]{article}
\pagestyle{empty}
\usepackage{slashbox}
\usepackage{multirow}
\begin{document}
\begin{tabular}{lllll}
& \multicolumn{1}{c}{3} & \multicolumn{1}{c}{5} & \multicolumn{1}{c}{2} & \\
\cline{2-4}
\multicolumn{1}{l|}{2} & \multicolumn{1}{l|}{\backslashbox{0}{6}} & \multicolumn{1}{l|}{\backslashbox{1}{0}} & \multicolumn{1}{l|}{\backslashbox{0}{4}} & 4 \\
\cline{2-4}
\multicolumn{1}{l|}{7} & \multicolumn{1}{l|}{\backslashbox{2}{1}} & \multicolumn{1}{l|}{\backslashbox{3}{5}} & \multicolumn{1}{l|}{\backslashbox{1}{4}} & 4 \\
\cline{2-4}
& \multicolumn{1}{c}{2} & \multicolumn{1}{c}{5} & \multicolumn{1}{c}{3} & \\
\end{tabular}
\end{document}
`
saluti
Claudio