Pyramid #1017
Pyramid #1018
Pyramid #1019
Generating function
$$U_{1018}(x, y) = \left(x + 1\right)^{3} \left(y + 1\right)^{2}$$
Explicit formula
$$T_{1018}(n, m, k) = {\binom{2 k}{m}} {\binom{3 k}{n}}$$
Data table
1 2 1 0 0 0 0
3 6 3 0 0 0 0
3 6 3 0 0 0 0
1 2 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
Related
Pyramid #1008: Change x y
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