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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 305 |
| 6 | 10734 |
| 7 | 502747 |
| 8 | 30344992 |
| 9 | 2307890097 |
| 10 | 216571514030 |
| 11 | 24619605092291 |
| 12 | 3337294343698248 |
| 13 | 532148381719443073 |
| 14 | 98646472269855762238 |
| 15 | 21041945289232131607995 |
| 16 | 5118447176652195630775424 |
| 17 | 1408601897794844346184122017 |
| 18 | 435481794298015565250651718302 |
[0,1,-2,3,8,305,10734,502747,30344992,2307890097, 216571514030,24619605092291,3337294343698248, 532148381719443073,98646472269855762238, 21041945289232131607995,5118447176652195630775424, 1408601897794844346184122017, 435481794298015565250651718302] |