This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| 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 |