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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 43 |
| 5 | 113 |
| 6 | 307 |
| 7 | 857 |
| 8 | 20707 |
| 9 | 181243 |
| 10 | 539633 |
| 11 | 14414443 |
| 12 | 129402307 |
| 13 | 31389448217 |
| 14 | 1853028778786433 |
| 15 | 5559077746424707 |
| 16 | 50031613818476443 |
| 17 | 150094772735952593 |
| 18 | 8862938260389989451257 |
| 19 | 26588814640432479998443 |
[3,7,17,43,113,307,857,20707,181243,539633, 14414443,129402307,31389448217,1853028778786433, 5559077746424707,50031613818476443, 150094772735952593,8862938260389989451257, 26588814640432479998443] |