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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 23 |
| 3 | 79 |
| 4 | 287 |
| 5 | 1087 |
| 6 | 4223 |
| 7 | 16639 |
| 8 | 66047 |
| 9 | 263167 |
| 10 | 1050623 |
| 11 | 4198399 |
| 12 | 16785407 |
| 13 | 67125247 |
| 14 | 268468223 |
| 15 | 1073807359 |
| 16 | 4295098367 |
| 17 | 17180131327 |
| 18 | 68720001023 |
| 19 | 274878955519 |
| 20 | 1099513724927 |
| 21 | 4398050705407 |
| 22 | 17592194433023 |
| 23 | 70368760954879 |
| 24 | 281475010265087 |
| 25 | 1125899973951487 |
[7,23,79,287,1087,4223,16639,66047,263167,1050623, 4198399,16785407,67125247,268468223,1073807359, 4295098367,17180131327,68720001023,274878955519, 1099513724927,4398050705407,17592194433023, 70368760954879,281475010265087,1125899973951487] |