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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 | 1 |
| 2 | -1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 24 |
| 6 | -480 |
| 7 | 720 |
| 8 | 13440 |
| 9 | 100800 |
| 10 | -1874880 |
| 11 | 3628800 |
| 12 | 22619520 |
| 13 | 479001600 |
| 14 | -36739422720 |
| 15 | 468583315200 |
| 16 | 6345334195200 |
| 17 | 20922789888000 |
| 18 | -4289844445286400 |
| 19 | 6402373705728000 |
| 20 | 363873320191180800 |
| 21 | 18895538930171904000 |
| 22 | -350378437544239104000 |
[1,1,-1,2,6,24,-480,720,13440,100800,-1874880, 3628800,22619520,479001600,-36739422720, 468583315200,6345334195200,20922789888000, -4289844445286400,6402373705728000, 363873320191180800,18895538930171904000, -350378437544239104000] |