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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 2352 |
| 3 | 30481920 |
| 4 | 9958443264000 |
| 5 | 71274072206937600000 |
| 6 | 10284003594061010227814400000 |
| 7 | 28352758990854707972694688215859200000 |
| 8 | 1439725057274629036644686315831322105348096000000 |
[6,2352,30481920,9958443264000, 71274072206937600000, 10284003594061010227814400000, 28352758990854707972694688215859200000, 1439725057274629036644686315831322105348096000000] |