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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 39 |
| 5 | 63 |
| 6 | 523 |
| 7 | 4983 |
| 8 | 25007 |
| 9 | 892217 |
| 10 | 1142775 |
| 11 | 1381311 |
| 12 | 1751751 |
[1,3,7,39,63,523,4983,25007,892217,1142775, 1381311,1751751] |