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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 14 |
| 4 | 69 |
| 5 | 581 |
| 6 | 8288 |
| 7 | 183749 |
| 8 | 5852151 |
| 9 | 304335082 |
| 10 | 26755090180 |
[1,5,14,69,581,8288,183749,5852151,304335082, 26755090180] |