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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 55 |
| 3 | 463 |
| 4 | 4159 |
| 5 | 39871 |
| 6 | 408703 |
| 7 | 4484095 |
| 8 | 52626943 |
| 9 | 659428351 |
| 10 | 8797030399 |
| 11 | 124546033663 |
| 12 | 1865317382143 |
| 13 | 29463497922559 |
| 14 | 489461328435199 |
| 15 | 8530417847785471 |
| 16 | 155621475302856703 |
| 17 | 2965833596006389759 |
[1,7,55,463,4159,39871,408703,4484095,52626943, 659428351,8797030399,124546033663,1865317382143, 29463497922559,489461328435199,8530417847785471, 155621475302856703,2965833596006389759] |