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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 36 |
| 4 | 2206 |
| 5 | 150000 |
| 6 | 13685760 |
| 7 | 16794009904 |
| 8 | 23538338288640 |
| 9 | 40111742758242240 |
| 10 | 678603619866009600000 |
| 11 | 19289305175281390070751204 |
| 12 | 619856418580365858926902640640 |
| 13 | 208006459829483370218035382709089280 |
| 14 | 78451383926677134672195807581733722937984 |
[1,1,6,36,2206,150000,13685760,16794009904, 23538338288640,40111742758242240, 678603619866009600000,19289305175281390070751204, 619856418580365858926902640640, 208006459829483370218035382709089280, 78451383926677134672195807581733722937984] |