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 | 2 |
| 1 | 3 |
| 2 | 6 |
| 3 | 16 |
| 4 | 38 |
| 5 | 88 |
| 6 | 204 |
| 7 | 474 |
| 8 | 1102 |
| 9 | 2562 |
| 10 | 5956 |
| 11 | 13846 |
| 12 | 32188 |
| 13 | 74828 |
| 14 | 173954 |
| 15 | 404394 |
| 16 | 940102 |
| 17 | 2185472 |
| 18 | 5080606 |
| 19 | 11810976 |
| 20 | 27457188 |
| 21 | 63830218 |
| 22 | 148387254 |
| 23 | 344958514 |
| 24 | 801931252 |
| 25 | 1864263982 |
| 26 | 4333887956 |
| 27 | 10075067156 |
| 28 | 23421689538 |
| 29 | 54448822258 |