Generating function
$$U_{676}(x, y) = \frac{1}{\left(1 - y\right)^{2} \left(x + 1\right)}$$
Explicit formula
$$T_{676}(n, m, k) = \left(-1\right)^{n} {\binom{k + n - 1}{n}} {\binom{2 k + m - 1}{m}}$$
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| -1 | -2 | -3 | -4 | -5 | -6 | -7 |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| -1 | -2 | -3 | -4 | -5 | -6 | -7 |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| -1 | -2 | -3 | -4 | -5 | -6 | -7 |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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