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| n | a(n) |
|---|---|
| 4 | 721 |
| 5 | 5702401 |
| 6 | 889574401 |
| 7 | 50812489728001 |
| 8 | 17377871486976001 |
| 9 | 3693145248412139520001 |
| 10 | 1263108856248528850649088000001 |
| 11 | 1174691236311131831103651840000001 |
[721,5702401,889574401,50812489728001, 17377871486976001,3693145248412139520001, 1263108856248528850649088000001, 1174691236311131831103651840000001] |