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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 105 |
| 5 | 217 |
| 6 | 651 |
| 7 | 3937 |
| 8 | 1003935 |
| 9 | 34200719 |
| 10 | 1128623727 |
| 11 | 70008871793 |
| 12 | 13651729999635 |
| 13 | 81920381265209 |
| 14 | 10567729183211961 |
| 15 | 3723363248885014259 |
| 16 | 14353565324451729968445 |
| 17 | 7377788865259657641937469 |
| 18 | 420533965319800485590435733 |
| 19 | 552582684400055732302638544229 |
| 20 | 3738221859966377029027349751709185 |
[1,3,7,105,217,651,3937,1003935,34200719, 1128623727,70008871793,13651729999635, 81920381265209,10567729183211961, 3723363248885014259,14353565324451729968445, 7377788865259657641937469, 420533965319800485590435733, 552582684400055732302638544229, 3738221859966377029027349751709185] |