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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 35 |
| 4 | 40391 |
| 5 | 53789260175 |
| 6 | 95393218491883573553951 |
| 7 | 300027707381709879256191290532493317737977820735 |
[0,1,35,40391,53789260175,95393218491883573553951, 300027707381709879256191290532493317737977820735] |