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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | -3 |
| 4 | 12 |
| 5 | -40 |
| 6 | 430 |
| 7 | -3591 |
| 8 | 37464 |
| 9 | -373752 |
| 10 | 4507738 |
| 11 | -58823875 |
| 12 | 870967460 |
| 13 | -13719012528 |
| 14 | 234072634822 |
| 15 | -4250060142615 |
| 16 | 82733999849648 |
| 17 | -1710175098180496 |
| 18 | 37504812533836722 |
| 19 | -867602777991744483 |
[0,0,2,-3,12,-40,430,-3591,37464,-373752,4507738, -58823875,870967460,-13719012528,234072634822, -4250060142615,82733999849648,-1710175098180496, 37504812533836722,-867602777991744483] |