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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 159 |
| 5 | 1651 |
| 6 | 21303 |
| 7 | 324619 |
| 8 | 5653119 |
| 9 | 110909251 |
| 10 | 2424648903 |
| 11 | 58430418619 |
| 12 | 1537673312079 |
| 13 | 43860906193651 |
| 14 | 1347852526593303 |
| 15 | 44392923532503019 |
| 16 | 1560023977386027039 |
| 17 | 58259266750803410851 |
| 18 | 2303999137417453606503 |
| 19 | 96188099015599819297819 |
| 20 | 4227325636692027926037999 |
[1,1,3,19,159,1651,21303,324619,5653119,110909251, 2424648903,58430418619,1537673312079, 43860906193651,1347852526593303,44392923532503019, 1560023977386027039,58259266750803410851, 2303999137417453606503,96188099015599819297819, 4227325636692027926037999] |