Generating function
$$U_{313}(x, y) = \frac{1}{\left(1 - x\right)^{2} \left(1 - y\right)^{2}}$$
Explicit formula
$$T_{313}(n, m, k) = {\binom{2 k + m - 1}{m}} {\binom{2 k + n - 1}{n}}$$
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 2 | 4 | 6 | 8 | 1 | 12 | 14 |
| 3 | 6 | 9 | 12 | 15 | 18 | 21 |
| 4 | 8 | 12 | 16 | 2 | 24 | 28 |
| 5 | 1 | 15 | 2 | 25 | 3 | 35 |
| 6 | 12 | 18 | 24 | 3 | 36 | 42 |
| 7 | 14 | 21 | 28 | 35 | 42 | 49 |
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