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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 109 |
| 5 | 131 |
| 6 | 607 |
| 7 | 863 |
| 8 | 2917 |
| 9 | 5923 |
| 10 | 12421 |
| 11 | 187507 |
| 12 | 353501 |
| 13 | 817519 |
[3,7,19,109,131,607,863,2917,5923,12421,187507, 353501,817519] |