Pyramid #1106
Pyramid #1107
Pyramid #1108
Generating function
$$U_{1107}(x, y) = \left(x \left(y + 1\right)^{2} + 1\right)^{2}$$
Explicit formula
$$T_{1107}(n, m, k) = {\binom{2 k}{n}} {\binom{2 n}{m}}$$
Data table
1 0 0 0 0 0 0
2 4 2 0 0 0 0
1 4 6 4 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
Related
Pyramid #1160: Right on x
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