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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1026608414145600 |
| 3 | 58142871081888953760431694254592000 |
| 4 | 3201055426099561623149772782827411540384767799931904000000 |
| 5 | 32039970364449358738657145679393908929276464603866377637139985914971871928320000000 |
[1,1026608414145600, 58142871081888953760431694254592000, 32010554260995616231497727828274115403847677999319\ 04000000, 32039970364449358738657145679393908929276464603866\ 377637139985914971871928320000000] |