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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 217 |
| 4 | 91140 |
| 5 | 128843140 |
| 6 | 511508441781 |
| 7 | 4960069104562005 |
| 8 | 105468145309870490840 |
| 9 | 4512934309457492170923216 |
| 10 | 362415672451851793780617637200 |
| 11 | 51563823623409518633102950412670240 |
[0,3,217,91140,128843140,511508441781, 4960069104562005,105468145309870490840, 4512934309457492170923216, 362415672451851793780617637200, 51563823623409518633102950412670240] |