Generating function
$$U_{56}(x, y) = \frac{1}{\left(1 - x\right)^{2} \left(1 - y\right)}$$
Explicit formula
$$T_{56}(n, m, k) = {\binom{k + m - 1}{m}} {\binom{2 k + n - 1}{n}}$$
| 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| 7 | 7 | 7 | 7 | 7 | 7 | 7 |
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