Pyramid #70
Generating function
$$U_{70}(x, y) = \frac{1}{- x + \left(1 - y\right)^{2}}$$
Explicit formula
$$T_{70}(n, m, k) = {\binom{k + n - 1}{n}} {\binom{2 k + m + 2 n - 1}{m}}$$
Data table
1 2 3 4 5 6 7
1 4 1 2 35 56 84
1 6 21 56 126 252 462
1 8 36 12 33 792 1716
1 1 55 22 715 2002 5005
1 12 78 364 1365 4368 12376
1 14 105 56 238 8568 27132
Export
expand_less