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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 85 |
| 4 | 745 |
| 5 | 8409 |
| 6 | 117613 |
| 7 | 1982629 |
| 8 | 39464401 |
| 9 | 912190449 |
| 10 | 24152719957 |
| 11 | 724395387805 |
| 12 | 24377798538361 |
| 13 | 913045021983273 |
| 14 | 37793566032030013 |
| 15 | 1718326694466838165 |
| 16 | 85350122951385331105 |
| 17 | 4609179886250736447969 |
| 18 | 269460743294547701329573 |
| 19 | 16987827203251213328307469 |
[1,3,13,85,745,8409,117613,1982629,39464401, 912190449,24152719957,724395387805,24377798538361, 913045021983273,37793566032030013, 1718326694466838165,85350122951385331105, 4609179886250736447969,269460743294547701329573, 16987827203251213328307469] |