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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 36 |
| 2 | 58800 |
| 3 | 4350842496 |
| 4 | 14616841474819584 |
| 5 | 2232275367429083934397440 |
| 6 | 15508029030753757178368051489382400 |
| 7 | 4903022043055128535359103830176804216217600000 |
| 8 | 70564996915837622037116996413540007182305594153356328960000 |
[1,36,58800,4350842496,14616841474819584, 2232275367429083934397440, 15508029030753757178368051489382400, 4903022043055128535359103830176804216217600000, 70564996915837622037116996413540007182305594153356\ 328960000] |