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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 80 |
| 3 | 2695 |
| 4 | 163059 |
| 5 | 4990235 |
| 6 | 324288311 |
| 7 | 10170499564 |
| 8 | 674288738013 |
| 9 | 21373928441126 |
| 10 | 1435823246721009 |
| 11 | 45884479727848365 |
| 12 | 3108101397467123619 |
| 13 | 99916343889082020272 |
| 14 | 6807459787910922090689 |
| 15 | 219837420324993531866814 |
[2,80,2695,163059,4990235,324288311,10170499564, 674288738013,21373928441126,1435823246721009, 45884479727848365,3108101397467123619, 99916343889082020272,6807459787910922090689, 219837420324993531866814] |