Pyramid #857
Generating function
$$U_{857}(x, y) = \frac{\left(y + 1\right)^{5}}{- x + \left(y + 1\right)^{3}}$$
Explicit formula
$$T_{857}(n, m, k) = {\binom{2 k - 3 n}{m}} {\binom{k + n - 1}{n}}$$
Data table
1 2 1 0 0 0 0
1 -1 1 -1 1 -1 1
1 -4 1 -2 35 -56 84
1 -7 28 -84 21 -462 924
1 -1 55 -22 715 -2002 5005
1 -13 91 -455 182 -6188 18564
1 -16 136 -816 3876 -15504 54264
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