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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 71 |
| 5 | 179 |
| 6 | 547 |
| 7 | 983 |
| 8 | 1283 |
| 9 | 1289 |
| 10 | 2909 |
| 11 | 3709 |
| 12 | 20269 |
| 13 | 40829 |
| 14 | 256579 |
| 15 | 772573 |
[2,3,7,71,179,547,983,1283,1289,2909,3709,20269, 40829,256579,772573] |