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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 20 |
| 4 | 1610 |
| 5 | 129654 |
| 6 | 11688369 |
| 7 | 1194822915 |
| 8 | 137766789810 |
| 9 | 17758192128830 |
| 10 | 2535895233070628 |
| 11 | 397875362655895761 |
| 12 | 68087081506276861665 |
| 13 | 12626853606957534296975 |
| 14 | 2523446241515288646389325 |
[0,0,20,1610,129654,11688369,1194822915, 137766789810,17758192128830,2535895233070628, 397875362655895761,68087081506276861665, 12626853606957534296975,2523446241515288646389325] |