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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 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | -12 |
| 5 | 51 |
| 6 | -300 |
| 7 | 2120 |
| 8 | -16968 |
| 9 | 152677 |
| 10 | -1526760 |
| 11 | 16794414 |
| 12 | -201532980 |
| 13 | 2619928663 |
| 14 | -36679001268 |
| 15 | 550185019124 |
| 16 | -8802960306000 |
| 17 | 149650325201865 |
| 18 | -2693705853633552 |
| 19 | 51180411219037658 |
| 20 | -1023608224380753180 |
[0,1,0,2,-12,51,-300,2120,-16968,152677,-1526760, 16794414,-201532980,2619928663,-36679001268, 550185019124,-8802960306000,149650325201865, -2693705853633552,51180411219037658, -1023608224380753180] |