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| n | a(n) |
|---|---|
| 1 | 168 |
| 2 | 10752 |
| 3 | 331520 |
| 4 | 691200 |
| 5 | 1556480 |
| 6 | 1612800 |
| 7 | 106151936 |
| 8 | 5099962368 |
| 9 | 4010593484800 |
[168,10752,331520,691200,1556480,1612800, 106151936,5099962368,4010593484800] |