Pyramid #7
Pyramid #8
Pyramid #9
Generating function
$$U_{8}(x, y) = \left(x + y\right) \left(y + 1\right)$$
Explicit formula
$$T_{8}(n, m, k) = {\binom{k}{n}} {\binom{k}{- k + m + n}}$$
Data table
0 1 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 #7: Change x y
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