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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 9408 |
| 4 | 63352393728 |
| 5 | 3947339798331748515840 |
| 6 | 5732998662938820430255187886059028480 |
| 7 | 417673987760293241182652126617960927525362518081132298240 |
[1,1,4,9408,63352393728,3947339798331748515840, 5732998662938820430255187886059028480, 41767398776029324118265212661796092752536251808113\ 2298240] |