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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 144 |
| 4 | 5952 |
| 5 | 772560 |
| 6 | 73664640 |
| 7 | 29745273600 |
| 8 | 8715934402560 |
| 9 | 5068085799813120 |
| 10 | 2756328707949465600 |
| 11 | 4581860819083475558400 |
| 12 | 2696083278990328597708800 |
| 13 | 7844679216026128507826995200 |
[1,6,144,5952,772560,73664640,29745273600, 8715934402560,5068085799813120, 2756328707949465600,4581860819083475558400, 2696083278990328597708800, 7844679216026128507826995200] |