Generating function
$$U_{206}(x, y) = - \frac{1}{- x^{2} + 2 x + y \left(x^{4} - 4 x^{3} + 6 x^{2} - 4 x + 1\right) - 1}$$
Explicit formula
$$T_{206}(n, m, k) = {\binom{k + m - 1}{m}} {\binom{2 k - 2 m + n - 1}{n}}$$
| 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 2 | 0 | -2 | -4 | -6 | -8 | -1 |
| 3 | 0 | 1 | 6 | 15 | 28 | 45 |
| 4 | 0 | 0 | -4 | -2 | -56 | -12 |
| 5 | 0 | 0 | 1 | 15 | 7 | 21 |
| 6 | 0 | 0 | 0 | -6 | -56 | -252 |
| 7 | 0 | 0 | 0 | 1 | 28 | 21 |
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