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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 60 |
| 3 | 1801800 |
| 4 | 11657093261814000 |
| 5 | 7167827541370578634694420017740000 |
| 6 | 291943326350524088652207164949980988754136887856059678357800000 |
[1,2,60,1801800,11657093261814000, 7167827541370578634694420017740000, 29194332635052408865220716494998098875413688785605\ 9678357800000] |