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 | 11 |
| 1 | 51 |
| 2 | 175 |
| 3 | 527 |
| 4 | 1471 |
| 5 | 3903 |
| 6 | 9983 |
| 7 | 24831 |
| 8 | 60415 |
| 9 | 144383 |
| 10 | 339967 |
| 11 | 790527 |
| 12 | 1818623 |
| 13 | 4145151 |
| 14 | 9371647 |
| 15 | 21037055 |
| 16 | 46923775 |
| 17 | 104071167 |
| 18 | 229638143 |
| 19 | 504365055 |
| 20 | 1103101951 |
| 21 | 2403336191 |
| 22 | 5217714175 |
| 23 | 11291066367 |
| 24 | 24360517631 |
| 25 | 52412022783 |
| 26 | 112474456063 |
| 27 | 240786604031 |