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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 396 |
| 4 | 35182 |
| 5 | 5655616 |
| 6 | 1840258874 |
| 7 | 1279020266434 |
| 8 | 1956482857537638 |
| 9 | 6709261067536603464 |
| 10 | 52210936089708881164828 |
| 11 | 929873887535519786302080272 |
| 12 | 38136664055521875662056947040494 |
[0,6,396,35182,5655616,1840258874,1279020266434, 1956482857537638,6709261067536603464, 52210936089708881164828, 929873887535519786302080272, 38136664055521875662056947040494] |