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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 53 |
| 3 | 1855 |
| 4 | 156425 |
| 5 | 19537595 |
| 6 | 3987121981 |
| 7 | 1087120051511 |
| 8 | 408148372272017 |
| 9 | 193531749818796403 |
| 10 | 116081047496759766725 |
| 11 | 84538055378229508493871 |
| 12 | 74205177566923695709271961 |
[1,3,53,1855,156425,19537595,3987121981, 1087120051511,408148372272017,193531749818796403, 116081047496759766725,84538055378229508493871, 74205177566923695709271961] |