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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 9 |
| 4 | 744 |
| 5 | 4179600 |
| 6 | 8448511339584 |
| 7 | 5768007101259200000000000049 |
| 8 | 5174534068654382362457957919012519218990703784333328400 |
| 9 | 2738806678866818978778889262772030983678218158753649709561749318814684327986697592167893627634348717226004356 |
[1,6,9,744,4179600,8448511339584, 5768007101259200000000000049, 51745340686543823624579579190125192189907037843333\ 28400, 27388066788668189787788892627720309836782181587536\ 49709561749318814684327986697592167893627634348717\ 226004356] |