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| n | a(n) |
|---|---|
| 1 | 1310799454720 |
| 2 | 3321735626954282018581900800 |
| 3 | 20877662827076969301744211245461828236480000 |
| 4 | 193433401300524863973681384616930307135746244016427424448000 |
[1310799454720,3321735626954282018581900800, 20877662827076969301744211245461828236480000, 19343340130052486397368138461693030713574624401642\ 7424448000] |