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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 | 1 |
| 3 | 0 |
| 4 | 9 |
| 5 | -20 |
| 6 | 177 |
| 7 | -1260 |
| 8 | 7105 |
| 9 | -99144 |
| 10 | 564049 |
| 11 | -10278840 |
| 12 | 77134761 |
| 13 | -1412196188 |
| 14 | 15082747617 |
| 15 | -257693157540 |
| 16 | 3771722331457 |
| 17 | -62330454304272 |
| 18 | 1150241027577697 |
| 19 | -19671866661968880 |
| 20 | 420212562193269513 |
[1,0,1,0,9,-20,177,-1260,7105,-99144,564049, -10278840,77134761,-1412196188,15082747617, -257693157540,3771722331457,-62330454304272, 1150241027577697,-19671866661968880, 420212562193269513] |