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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 432 |
| 4 | 11943936 |
| 5 | 1031956070400000 |
| 6 | 4159895825138319360000000000 |
| 7 | 13809882382682787973867537170432000000000000000 |
| 8 | 769161257109634779902443718589603914508004789479014400000000000000000000 |
| 9 | 16596916396875768196482032091931000424134701157007816971266990744831779993781534720000000000000000000000000 |
[1,1,4,432,11943936,1031956070400000, 4159895825138319360000000000, 13809882382682787973867537170432000000000000000, 76916125710963477990244371858960391450800478947901\ 4400000000000000000000, 16596916396875768196482032091931000424134701157007\ 81697126699074483177999378153472000000000000000000\ 0000000] |