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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 4482037 |
| 8 | 21762709934980 |
| 9 | 104996653267533662740 |
| 10 | 506816536013640476467362442 |
| 11 | 2446300028783605805772822454177234 |
| 12 | 11807825441932996339362317150047214843540 |
[1,4482037,21762709934980,104996653267533662740, 506816536013640476467362442, 2446300028783605805772822454177234, 11807825441932996339362317150047214843540] |