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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 36840 |
| 5 | 2461011960 |
| 6 | 753889607031060 |
| 7 | 897212452713773709765 |
| 8 | 3625229476732355845849016640 |
| 9 | 44424128771680100390106879719766312 |
| 10 | 1501841442695075526144022337210256443707200 |
[0,0,6,36840,2461011960,753889607031060, 897212452713773709765, 3625229476732355845849016640, 44424128771680100390106879719766312, 1501841442695075526144022337210256443707200] |