Generating function
$$U_{1119}(x, y) = \left(x \left(y + 1\right)^{2} + 1\right)^{3}$$
Explicit formula
$$T_{1119}(n, m, k) = {\binom{3 k}{n}} {\binom{2 n}{m}}$$
Data table
1 0 0 0 0 0 0
3 6 3 0 0 0 0
3 12 18 12 3 0 0
1 6 15 2 15 6 1
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
Related
Export
expand_less