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| n | a(n) |
|---|---|
| 1 | 255 |
| 2 | 1231 |
| 3 | 6217 |
| 4 | 34163 |
| 5 | 191657 |
| 6 | 1116735 |
| 7 | 6597729 |
| 8 | 39752795 |
| 9 | 241456349 |
| 10 | 1481423855 |
| 11 | 9128173539 |
| 12 | 56528510141 |
| 13 | 350835283263 |
| 14 | 2182763442241 |
| 15 | 13595247632269 |
| 16 | 84778601345407 |
| 17 | 528959639062227 |
| 18 | 3302250773429227 |
[255,1231,6217,34163,191657,1116735,6597729, 39752795,241456349,1481423855,9128173539, 56528510141,350835283263,2182763442241, 13595247632269,84778601345407,528959639062227, 3302250773429227] |