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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 24 |
| 3 | 6096 |
| 4 | 1548360 |
| 5 | 393277344 |
| 6 | 99890897016 |
| 7 | 25371894564720 |
| 8 | 6444361328541864 |
| 9 | 1636842405555068736 |
| 10 | 415751526649658917080 |
| 11 | 105599250926607809869584 |
| 12 | 26821793983831734047957256 |
[0,24,6096,1548360,393277344,99890897016, 25371894564720,6444361328541864, 1636842405555068736,415751526649658917080, 105599250926607809869584, 26821793983831734047957256] |