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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 13 |
| 3 | 61 |
| 4 | 109 |
| 5 | 1009 |
| 6 | 2689 |
| 7 | 8089 |
| 8 | 33049 |
| 9 | 53881 |
| 10 | 87481 |
| 11 | 483289 |
| 12 | 515761 |
| 13 | 1083289 |
| 14 | 3818929 |
| 15 | 9257329 |
[2,13,61,109,1009,2689,8089,33049,53881,87481, 483289,515761,1083289,3818929,9257329] |