Pyramid #986
Generating function
$$U_{986}(x, y) = \frac{x \left(y + 1\right) + 1}{\left(y + 1\right)^{2}}$$
Explicit formula
$$T_{986}(n, m, k) = {\binom{k}{n}} {\binom{- 2 k + n}{m}}$$
Data table
1 -2 3 -4 5 -6 7
1 -1 1 -1 1 -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
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