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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 47 |
| 4 | 95 |
| 5 | 703 |
| 6 | 1407 |
| 7 | 11007 |
| 8 | 22015 |
| 9 | 175103 |
| 10 | 350207 |
| 11 | 2797567 |
| 12 | 5595135 |
| 13 | 44744703 |
| 14 | 89489407 |
| 15 | 715849727 |
| 16 | 1431699455 |
| 17 | 11453333503 |
| 18 | 22906667007 |
| 19 | 183252287487 |
| 20 | 366504574975 |
| 21 | 2932032405503 |
| 22 | 5864064811007 |
| 23 | 46912501710847 |
| 24 | 93825003421695 |
| 25 | 750599960264703 |
[1,3,7,47,95,703,1407,11007,22015,175103,350207, 2797567,5595135,44744703,89489407,715849727, 1431699455,11453333503,22906667007,183252287487, 366504574975,2932032405503,5864064811007, 46912501710847,93825003421695,750599960264703] |