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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | -1 |
| 3 | 1 |
| 4 | 40 |
| 5 | -81 |
| 6 | -1559 |
| 7 | 4880 |
| 8 | 59039 |
| 9 | -259119 |
| 10 | -2161480 |
| 11 | 12785359 |
| 12 | 75835321 |
| 13 | -600035040 |
| 14 | -2509213121 |
| 15 | 27110649761 |
| 16 | 75767088200 |
| 17 | -1187303728401 |
| 18 | -1919146887799 |
| 19 | 50598599752240 |
| 20 | 28086422647519 |
| 21 | -2102629012489359 |
| 22 | 951085683941080 |
| 23 | 85256703828122639 |
[0,-1,1,40,-81,-1559,4880,59039,-259119,-2161480, 12785359,75835321,-600035040,-2509213121, 27110649761,75767088200,-1187303728401, -1919146887799,50598599752240,28086422647519, -2102629012489359,951085683941080, 85256703828122639] |