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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 77 |
| 4 | 39210 |
| 5 | 48347502 |
| 6 | 187829420863 |
| 7 | 2247557960061633 |
| 8 | 79899827658375960942 |
[0,0,77,39210,48347502,187829420863, 2247557960061633,79899827658375960942] |