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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 43 |
| 6 | 127 |
| 7 | 373 |
| 8 | 1229 |
| 9 | 4177 |
| 10 | 15439 |
| 11 | 59141 |
| 12 | 242393 |
| 13 | 1028051 |
| 14 | 4607803 |
| 15 | 21355507 |
| 16 | 103637683 |
| 17 | 519232333 |
| 18 | 2706119771 |
| 19 | 14531789681 |
| 20 | 80784565951 |
| 21 | 461802480011 |
| 22 | 2722713380077 |
| 23 | 16475872190489 |
| 24 | 102523358575031 |
[2,3,7,17,43,127,373,1229,4177,15439,59141,242393, 1028051,4607803,21355507,103637683,519232333, 2706119771,14531789681,80784565951,461802480011, 2722713380077,16475872190489,102523358575031] |