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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 63504 |
| 3 | 2260442279270448 |
| 4 | 3379470372507391964272022793486336 |
| 5 | 2097229364987262298214192667129919538956418868293588090880000 |
[3,63504,2260442279270448, 3379470372507391964272022793486336, 20972293649872622982141926671299195389564188682935\ 88090880000] |