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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 918 |
| 3 | 561573 |
| 4 | 267947653 |
| 5 | 119394609842 |
| 6 | 52019083898820 |
| 7 | 22467362744958042 |
| 8 | 9668189828315322283 |
[0,918,561573,267947653,119394609842, 52019083898820,22467362744958042, 9668189828315322283] |