Generating function
$$U_{78}(x, y) = \left(x + 1\right)^{2} \left(y + 1\right)$$
Explicit formula
$$T_{78}(n, m, k) = {\binom{k}{m}} {\binom{2 k}{n}}$$
| 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2 | 2 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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