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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | 120 |
| 4 | 8400 |
| 5 | 237120 |
| 6 | 41126976 |
| 7 | 1414288512 |
| 8 | 774359589120 |
| 9 | -7305842952192 |
| 10 | 43904341686828032 |
| 11 | -6519096982922602496 |
| 12 | 6522454342040400908288 |
| 13 | -2519478812073315269099520 |
[1,0,12,120,8400,237120,41126976,1414288512, 774359589120,-7305842952192,43904341686828032, -6519096982922602496,6522454342040400908288, -2519478812073315269099520] |