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) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 26 |
| 7 | 71 |
| 8 | 197 |
| 9 | 543 |
| 10 | 1507 |
| 11 | 4186 |
| 12 | 11722 |
| 13 | 32883 |
| 14 | 92724 |
| 15 | 262179 |
| 16 | 743792 |
| 17 | 2115019 |
| 18 | 6028779 |
| 19 | 17217093 |
| 20 | 49258009 |
| 21 | 141142096 |
| 22 | 404997704 |
| 23 | 1163569094 |
| 24 | 3346830818 |
| 25 | 9636723582 |
| 26 | 27774427243 |
| 27 | 80121104084 |
| 28 | 231317022483 |
| 29 | 668346261557 |