Generating function
$$U_{1391}(x, y) = \frac{\frac{y}{1 - x} + 1}{\left(1 - x\right)^{2}}$$
Explicit formula
$$T_{1391}(n, m, k) = {\binom{k}{m}} {\binom{2 k + m + n - 1}{n}}$$
| 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2 | 3 | 0 | 0 | 0 | 0 | 0 |
| 3 | 6 | 0 | 0 | 0 | 0 | 0 |
| 4 | 1 | 0 | 0 | 0 | 0 | 0 |
| 5 | 15 | 0 | 0 | 0 | 0 | 0 |
| 6 | 21 | 0 | 0 | 0 | 0 | 0 |
| 7 | 28 | 0 | 0 | 0 | 0 | 0 |
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