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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 42 |
| 4 | 112418 |
| 5 | 1105696796 |
| 6 | 24178822553773 |
| 7 | 1029696155560021174 |
| 8 | 77938101941693076258854 |
[0,1,42,112418,1105696796,24178822553773, 1029696155560021174,77938101941693076258854] |