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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 648 |
| 3 | 31104 |
| 4 | 11197440 |
| 5 | 40633270272 |
| 6 | 8126654054400 |
| 7 | 367789143490560 |
| 8 | 1265121095778828288000 |
| 9 | 1943226003116280250368 |
| 10 | 42473368353827268329472000 |
| 11 | 1552949905905681518542454784000 |
[3,648,31104,11197440,40633270272,8126654054400, 367789143490560,1265121095778828288000, 1943226003116280250368,42473368353827268329472000, 1552949905905681518542454784000] |