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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 5 |
| 6 | 138 |
| 7 | 201 |
| 8 | 13032 |
| 9 | 19990 |
| 10 | 4095612 |
| 11 | 7026883 |
| 12 | 4451051502 |
[0,0,0,3,5,138,201,13032,19990,4095612,7026883, 4451051502] |