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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 174 |
| 4 | 24360 |
| 5 | 15198120 |
| 6 | 38415132000 |
| 7 | 376482729702240 |
| 8 | 14139748304132048640 |
| 9 | 2040859528996474439366400 |
| 10 | 1141301651605590355550899891200 |
| 11 | 2494751188402618305982805631973248000 |
| 12 | 21474225685319103561274021904272069843353600 |
[1,1,6,174,24360,15198120,38415132000, 376482729702240,14139748304132048640, 2040859528996474439366400, 1141301651605590355550899891200, 2494751188402618305982805631973248000, 21474225685319103561274021904272069843353600] |