The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 29 |
| 3 | 115 |
| 4 | 477 |
| 5 | 1843 |
| 6 | 7645 |
| 7 | 29491 |
| 8 | 122333 |
| 9 | 471859 |
| 10 | 1957341 |
| 11 | 7549747 |
| 12 | 31317469 |
| 13 | 120795955 |
| 14 | 501079517 |
| 15 | 1932735283 |
| 16 | 8017272285 |
| 17 | 30923764531 |
| 18 | 128276356573 |
| 19 | 494780232499 |
| 20 | 2052421705181 |
| 21 | 7916483719987 |
| 22 | 32838747282909 |
| 23 | 126663739519795 |
| 24 | 525419956526557 |
[1,7,29,115,477,1843,7645,29491,122333,471859, 1957341,7549747,31317469,120795955,501079517, 1932735283,8017272285,30923764531,128276356573, 494780232499,2052421705181,7916483719987, 32838747282909,126663739519795,525419956526557] |