Pyramid #725
Generating function
$$U_{725}(x, y) = \frac{\left(y + 1\right)^{4}}{- x \left(y + 1\right) + 1}$$
Explicit formula
$$T_{725}(n, m, k) = {\binom{4 k + n}{m}} {\binom{k + n - 1}{n}}$$
Data table
1 4 6 4 1 0 0
1 5 1 1 5 1 0
1 6 15 2 15 6 1
1 7 21 35 35 21 7
1 8 28 56 7 56 28
1 9 36 84 126 126 84
1 1 45 12 21 252 21
Export
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