Pyramid #726
Pyramid #727
Pyramid #728
Generating function
$$U_{727}(x, y) = x + y^{2} + y \left(x + 2\right) + 1$$
Explicit formula
$$T_{727}(n, m, k) = {\binom{k}{n}} {\binom{2 k - n}{m}}$$
Data table
1 2 1 0 0 0 0
1 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 0 0 0
0 0 0 0 0 0 0
Related
Pyramid #42: Right on x
Pyramid #208: Change x y
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