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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 211 |
| 5 | 2311 |
| 6 | 15017 |
| 7 | 85091 |
| 8 | 1616621 |
| 9 | 22309297 |
| 10 | 3234846617 |
| 11 | 200560490131 |
| 12 | 3710369067407 |
| 13 | 20283350901829 |
| 14 | 872184088778017 |
| 15 | 307444891294245707 |
| 16 | 775932344695001107 |
| 17 | 961380175077106319537 |
| 18 | 19548063559901161830551 |
[3,7,31,211,2311,15017,85091,1616621,22309297, 3234846617,200560490131,3710369067407, 20283350901829,872184088778017,307444891294245707, 775932344695001107,961380175077106319537, 19548063559901161830551] |