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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 137 |
| 4 | 5639 |
| 5 | 641129 |
| 6 | 152921807 |
| 7 | 65818751039 |
| 8 | 46091763604421 |
[1,3,11,137,5639,641129,152921807,65818751039, 46091763604421] |