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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 168168000 |
| 6 | 666569141498660400 |
| 7 | 12218892645550878420052920000 |
| 8 | 959794291357783500093926796260896462300 |
| 9 | 289360589460480315988823313632867603848637000544000 |
[0,0,0,1,168168000,666569141498660400, 12218892645550878420052920000, 959794291357783500093926796260896462300, 28936058946048031598882331363286760384863700054400\ 0] |