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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 616 |
| 3 | 50077 |
| 4 | 2225293 |
| 5 | 107701719 |
| 6 | 5618116265 |
| 7 | 290895472306 |
| 8 | 14934409278104 |
| 9 | 767037960293079 |
[1,616,50077,2225293,107701719,5618116265, 290895472306,14934409278104,767037960293079] |