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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | -240 |
| 4 | 5712 |
| 5 | -266880 |
| 6 | 18566592 |
| 7 | -1488963840 |
| 8 | 141287377152 |
| 9 | -16736203345920 |
| 10 | 2412897423240192 |
| 11 | -402658140395089920 |
| 12 | 76287123858146906112 |
| 13 | -16430034737688309104640 |
| 14 | 4011640516519571786022912 |
| 15 | -1097783068806961397511290880 |
[1,0,12,-240,5712,-266880,18566592,-1488963840, 141287377152,-16736203345920,2412897423240192, -402658140395089920,76287123858146906112, -16430034737688309104640, 4011640516519571786022912, -1097783068806961397511290880] |