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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 19 |
| 5 | 317 |
| 6 | 5592 |
| 7 | 108839 |
| 8 | 2356175 |
| 9 | 56590729 |
| 10 | 1499304898 |
| 11 | 43532688017 |
| 12 | 1376491137807 |
| 13 | 47122376352941 |
| 14 | 1737338689842008 |
| 15 | 68657874376063231 |
| 16 | 2896049933653455241 |
| 17 | 129892644397271578571 |
| 18 | 6173717934189145195530 |
| 19 | 309998781844881257871161 |
| 20 | 16399060640250318161199785 |
[1,19,317,5592,108839,2356175,56590729,1499304898, 43532688017,1376491137807,47122376352941, 1737338689842008,68657874376063231, 2896049933653455241,129892644397271578571, 6173717934189145195530,309998781844881257871161, 16399060640250318161199785] |