| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 588 |
| 5 | 22560 |
| 6 | 1201320 |
| 7 | 82875744 |
| 8 | 7085373456 |
| 9 | 727827579648 |
| 10 | 87810122446560 |
| 11 | 12227912455651200 |
| 12 | 1938610503725962176 |
| 13 | 346053263639068417536 |
| 14 | 68919212804888587849344 |
[1,2,24,588,22560,1201320,82875744,7085373456, 727827579648,87810122446560,12227912455651200, 1938610503725962176,346053263639068417536, 68919212804888587849344] |