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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 35 |
| 4 | 20610 |
| 5 | 223627120 |
| 6 | 28915310755268 |
| 7 | 27358439337236435007 |
| 8 | 169060028840088558937461518 |
[0,1,35,20610,223627120,28915310755268, 27358439337236435007,169060028840088558937461518] |