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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 17 |
| 2 | 107 |
| 3 | 647 |
| 4 | 3887 |
| 5 | 23327 |
| 6 | 139967 |
| 7 | 839807 |
| 8 | 5038847 |
| 9 | 30233087 |
| 10 | 181398527 |
| 11 | 1088391167 |
| 12 | 6530347007 |
| 13 | 39182082047 |
| 14 | 235092492287 |
| 15 | 1410554953727 |
| 16 | 8463329722367 |
| 17 | 50779978334207 |
| 18 | 304679870005247 |
| 19 | 1828079220031487 |
[2,17,107,647,3887,23327,139967,839807,5038847, 30233087,181398527,1088391167,6530347007, 39182082047,235092492287,1410554953727, 8463329722367,50779978334207,304679870005247, 1828079220031487] |