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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 11 |
| 3 | 47 |
| 4 | 191 |
| 5 | 779 |
| 6 | 1563 |
| 7 | 6287 |
| 8 | 50331 |
| 9 | 201639 |
| 10 | 403341 |
| 11 | 1614057 |
| 12 | 6456459 |
| 13 | 25828839 |
| 14 | 51658107 |
| 15 | 206638863 |
| 16 | 3306228243 |
| 17 | 13225022367 |
| 18 | 26450056889 |
| 19 | 105800458501 |
| 20 | 423201880193 |
| 21 | 1692808490741 |
| 22 | 3385617069661 |
| 23 | 13542470306761 |
| 24 | 108339763130127 |
| 25 | 433359069421483 |
[1,5,11,47,191,779,1563,6287,50331,201639,403341, 1614057,6456459,25828839,51658107,206638863, 3306228243,13225022367,26450056889,105800458501, 423201880193,1692808490741,3385617069661, 13542470306761,108339763130127,433359069421483] |