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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 39 |
| 4 | 391 |
| 5 | 7116 |
| 6 | 215645 |
| 7 | 11464709 |
| 8 | 1047501118 |
| 9 | 164954468453 |
| 10 | 45226508899186 |
[1,7,39,391,7116,215645,11464709,1047501118, 164954468453,45226508899186] |