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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 8 |
| 3 | 216 |
| 4 | 12032 |
| 5 | 1075328 |
| 6 | 140944000 |
| 7 | 25464568832 |
| 8 | 6065774456832 |
| 9 | 1842040163078144 |
| 10 | 694620312112857088 |
| 11 | 318448731218429771776 |
| 12 | 174429761567957718302720 |
| 13 | 112504917152076237383401472 |
[1,0,8,216,12032,1075328,140944000,25464568832, 6065774456832,1842040163078144,694620312112857088, 318448731218429771776,174429761567957718302720, 112504917152076237383401472] |