TeX source:

\begin{array}{l|lllllllllllll}\ 3 & 5 & 6 & 8 & & & & & & \\ 3 & 0 & 0 & 1 & 1 & 2 & 4 & & & & \\ 2 & 5 & 6 & 6 & 7 & 7 & 8 & 8 & 9 & 9 & \\ 2 & 0 & 0 & 0 & 0 & 1 & 2 & 2 & 4 & & & \\ 1 & 5 & 5 & 5 & 6 & 6 & 7 & 7 & 7 & 8 & 8 & 9 \\ 1 & 0 & 0 & 1 & 3 & 4 & 4 & 4 & & & \\\ 0 & 5 & 6 & 8 & 8 & & & & & \\ 0 & 4 & & & & & & & \end{array}