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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 600 |
| 3 | 2116800 |
| 4 | 149361408000 |
| 5 | 195185487974400000 |
| 6 | 4526188681429365350400000 |
| 7 | 1814098233992362204186460160000000 |
| 8 | 12350461816416310792905806186828267520000000 |
[4,600,2116800,149361408000,195185487974400000, 4526188681429365350400000, 1814098233992362204186460160000000, 12350461816416310792905806186828267520000000] |