Generating function
$$U_{28}(x, y) = \frac{x + 1}{- x y + 1}$$
Explicit formula
$$T_{28}(n, m, k) = {\binom{k}{- m + n}} {\binom{k + m - 1}{m}}$$
| 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 |
| 0 | 0 | 0 | 1 | 1 | 0 | 0 |
| 0 | 0 | 0 | 0 | 1 | 1 | 0 |
| 0 | 0 | 0 | 0 | 0 | 1 | 1 |
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