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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 34 |
| 4 | 627 |
| 5 | 16890 |
| 6 | 1276986 |
| 7 | 209785488 |
| 8 | 84453386767 |
| 9 | 71088592371829 |
[1,9,34,627,16890,1276986,209785488,84453386767, 71088592371829] |