Pyramid #8
Pyramid #9
Pyramid #10
Generating function
$$U_{9}(x, y) = x^{2} + x + y$$
Explicit formula
$$T_{9}(n, m, k) = {\binom{k}{m}} {\binom{k - m}{- k + m + n}}$$
Data table
0 1 0 0 0 0 0
1 0 0 0 0 0 0
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
Related
Pyramid #1327: Change x y
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