Pyramid #862
Pyramid #863
Pyramid #864
Generating function
$$U_{863}(x, y) = \frac{x + \left(y + 1\right)^{8}}{\left(y + 1\right)^{5}}$$
Explicit formula
$$T_{863}(n, m, k) = {\binom{k}{n}} {\binom{3 k - 8 n}{m}}$$
Data table
1 3 3 1 0 0 0
1 -5 15 -35 7 -126 21
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 #862: Right on x
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