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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 30 |
| 3 | 756 |
| 4 | 16632 |
| 5 | 360360 |
| 6 | 7876440 |
| 7 | 174594420 |
| 8 | 3926434512 |
| 9 | 89492111280 |
| 10 | 2064420294300 |
| 11 | 48134517631200 |
| 12 | 1133012491934400 |
| 13 | 26895067957892160 |
| 14 | 643240375326254160 |
| 15 | 15487976684184750900 |
| 16 | 375182135475713517600 |
[0,30,756,16632,360360,7876440,174594420, 3926434512,89492111280,2064420294300, 48134517631200,1133012491934400,26895067957892160, 643240375326254160,15487976684184750900, 375182135475713517600] |