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) |
|---|---|
| 2 | 22148167706 |
| 3 | 52012 |
| 4 | 10828 |
| 5 | 24601 |
| 6 | 23660 |
| 7 | 29114 |
| 8 | 58967 |
| 9 | 118828 |
| 10 | 238600 |
| 11 | 478099 |
| 12 | 957324 |
| 13 | 1916191 |
| 14 | 3834167 |
| 15 | 7669094 |
| 16 | 15335488 |
| 17 | 30667762 |
| 18 | 61337894 |
| 19 | 122679755 |
| 20 | 245357929 |
| 21 | 490718137 |
| 22 | 981456651 |
| 23 | 1962956352 |
| 24 | 3925957422 |
| 25 | 7851819466 |
| 26 | 15703524589 |
| 27 | 31406984903 |
| 28 | 62813576969 |