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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | -3 |
| 4 | 31 |
| 5 | -375 |
| 6 | 5911 |
| 7 | -113463 |
| 8 | 2571031 |
| 9 | -67170855 |
| 10 | 1987919671 |
| 11 | -65731585623 |
| 12 | 2401646633431 |
| 13 | -96089053104135 |
| 14 | 4178215255335031 |
| 15 | -196193483904124983 |
| 16 | 9894077286353278231 |
| 17 | -533334378459657706215 |
| 18 | 30602112192036616407991 |
[1,-3,31,-375,5911,-113463,2571031,-67170855, 1987919671,-65731585623,2401646633431, -96089053104135,4178215255335031, -196193483904124983,9894077286353278231, -533334378459657706215,30602112192036616407991] |