Pyramid #1108
Pyramid #1109
Pyramid #1110
Generating function
$$U_{1109}(x, y) = \left(\frac{x}{1 - y} + 1\right)^{2}$$
Explicit formula
$$T_{1109}(n, m, k) = {\binom{2 k}{n}} {\binom{m + n - 1}{m}}$$
Data table
1 0 0 0 0 0 0
2 2 2 2 2 2 2
1 2 3 4 5 6 7
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 #804: Right on x
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