Generating function
$$U_{998}(x, y) = \frac{1 - y}{- \frac{x}{1 - y} + 1}$$
Explicit formula
$$T_{998}(n, m, k) = {\binom{k + n - 1}{n}} {\binom{- k + m + n - 1}{m}}$$
| 1 | -1 | 0 | 0 | 0 | 0 | 0 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1 | 3 | 6 | 1 | 15 | 21 | 28 |
| 1 | 4 | 1 | 2 | 35 | 56 | 84 |
| 1 | 5 | 15 | 35 | 7 | 126 | 21 |
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