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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 24336 |
| 3 | 870746557824 |
| 4 | 1311726482483997806493696 |
| 5 | 256433546267136937832915286844640487014400 |
| 6 | 15678550451426175377500759401206644047210595564950427820202393600 |
[1,6,24336,870746557824,1311726482483997806493696, 256433546267136937832915286844640487014400, 15678550451426175377500759401206644047210595564950\ 427820202393600] |