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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3489 |
| 5 | 5754681 |
| 6 | 15031688395 |
| 7 | 85146473995739 |
| 8 | 1221835613883859705 |
| 9 | 48879331646085761019504 |
| 10 | 5817604509321397715670886548 |
| 11 | 2157782748250229924192241839158932 |
[0,0,1,3489,5754681,15031688395,85146473995739, 1221835613883859705,48879331646085761019504, 5817604509321397715670886548, 2157782748250229924192241839158932] |