Pyramid #153
Generating function
$$U_{153}(x, y) = x \left(y + 1\right)^{3} + 1$$
Explicit formula
$$T_{153}(n, m, k) = {\binom{k}{n}} {\binom{3 n}{m}}$$
Data table
1 0 0 0 0 0 0
1 3 3 1 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
Export
expand_less