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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 28 |
| 3 | -728 |
| 4 | 54416 |
| 5 | -5676352 |
| 6 | 900432960 |
| 7 | -193766436992 |
| 8 | 55349093955840 |
| 9 | -20153308820338688 |
| 10 | 9138844606925237248 |
| 11 | -5050190610067417167872 |
| 12 | 3343568694767924711428096 |
| 13 | -2613638716122945595362951168 |
[1,0,28,-728,54416,-5676352,900432960, -193766436992,55349093955840,-20153308820338688, 9138844606925237248,-5050190610067417167872, 3343568694767924711428096, -2613638716122945595362951168] |