Pyramid #1107
Pyramid #1108
Pyramid #1109
Generating function
$$U_{1108}(x, y) = \left(x \left(y + 1\right)^{3} + 1\right)^{2}$$
Explicit formula
$$T_{1108}(n, m, k) = {\binom{2 k}{n}} {\binom{3 n}{m}}$$
Data table
1 0 0 0 0 0 0
2 6 6 2 0 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
0 0 0 0 0 0 0
Related
Pyramid #1161: Right on x
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