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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 0 |
| 5 | -15 |
| 6 | 90 |
| 7 | 945 |
| 8 | -2520 |
| 9 | -21735 |
| 10 | 368550 |
| 11 | 3898125 |
| 12 | -29313900 |
| 13 | -200675475 |
| 14 | 7122965850 |
| 15 | 76834382625 |
| 16 | -1133998866000 |
| 17 | -6451321251375 |
| 18 | 432213196164750 |
| 19 | 4637298724183125 |
| 20 | -115564330313932500 |
[1,0,0,3,0,-15,90,945,-2520,-21735,368550,3898125, -29313900,-200675475,7122965850,76834382625, -1133998866000,-6451321251375,432213196164750, 4637298724183125,-115564330313932500] |