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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 478483200 |
| 3 | 6401339808768000 |
| 4 | 620429964386047303680000 |
| 5 | 265250626231132937174895820800000 |
| 6 | 371992180902371387782970387300352000000000 |
[0,478483200,6401339808768000, 620429964386047303680000, 265250626231132937174895820800000, 371992180902371387782970387300352000000000] |