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| n | a(n) |
|---|---|
| 3 | 2 |
| 4 | 7 |
| 5 | 13 |
| 6 | 47 |
| 7 | 103 |
| 8 | 383 |
| 9 | 941 |
| 10 | 3833 |
| 11 | 10391 |
| 12 | 46073 |
| 13 | 135131 |
| 14 | 645097 |
| 15 | 2027023 |
| 16 | 10321919 |
| 17 | 34459423 |
| 18 | 185794463 |
| 19 | 654729073 |
| 20 | 3715891181 |
| 21 | 13749310511 |
| 22 | 81749606383 |
| 23 | 316234143163 |
| 24 | 1961990553581 |
| 25 | 7905853580621 |
| 26 | 51011754393599 |
[2,7,13,47,103,383,941,3833,10391,46073,135131, 645097,2027023,10321919,34459423,185794463, 654729073,3715891181,13749310511,81749606383, 316234143163,1961990553581,7905853580621, 51011754393599] |