Pyramid #203
Pyramid #204
Pyramid #205
Generating function
$$U_{204}(x, y) = - x + \frac{y}{\left(1 - x\right)^{2}} + 1$$
Explicit formula
$$T_{204}(n, m, k) = {\binom{k}{m}} {\binom{- k + 3 m + n - 1}{n}}$$
Data table
1 1 0 0 0 0 0
-1 2 0 0 0 0 0
0 3 0 0 0 0 0
0 4 0 0 0 0 0
0 5 0 0 0 0 0
0 6 0 0 0 0 0
0 7 0 0 0 0 0
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