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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 | -1 |
| 3 | 1 |
| 4 | -6 |
| 5 | 23 |
| 6 | -135 |
| 7 | 824 |
| 8 | -6580 |
| 9 | 56853 |
| 10 | -566685 |
| 11 | 6182834 |
| 12 | -74106054 |
| 13 | 961908023 |
| 14 | -13463412963 |
| 15 | 201897294416 |
| 16 | -3230214322920 |
| 17 | 54911338071817 |
| 18 | -988396711394553 |
| 19 | 18779422653489278 |
| 20 | -375588020724014010 |
[0,0,-1,1,-6,23,-135,824,-6580,56853,-566685, 6182834,-74106054,961908023,-13463412963, 201897294416,-3230214322920,54911338071817, -988396711394553,18779422653489278, -375588020724014010] |