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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -2 |
| 3 | 10 |
| 4 | -80 |
| 5 | 1000 |
| 6 | -21872 |
| 7 | 977584 |
| 8 | -96293648 |
| 9 | 20624493808 |
| 10 | -9328274380160 |
| 11 | 8744603171127040 |
| 12 | -16802076392609925440 |
| 13 | 65695424926762378460992 |
| 14 | -520141011157056880989068672 |
[1,1,-2,10,-80,1000,-21872,977584,-96293648, 20624493808,-9328274380160,8744603171127040, -16802076392609925440,65695424926762378460992, -520141011157056880989068672] |