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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -24 |
| 3 | 104 |
| 4 | 1792 |
| 5 | -68608 |
| 6 | 1203840 |
| 7 | 5570816 |
| 8 | -1636425728 |
| 9 | 86205304832 |
| 10 | -2289265803264 |
| 11 | -73881736609792 |
| 12 | 15846608494821376 |
| 13 | -1309579649460404224 |
| 14 | 56807804221374332928 |
| 15 | 2613072244764189655040 |
| 16 | -930940291170336707182592 |
[1,2,-24,104,1792,-68608,1203840,5570816, -1636425728,86205304832,-2289265803264, -73881736609792,15846608494821376, -1309579649460404224,56807804221374332928, 2613072244764189655040,-930940291170336707182592] |