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 | 4 |
| 2 | 8 |
| 3 | 17 |
| 4 | 38 |
| 5 | 84 |
| 6 | 187 |
| 7 | 418 |
| 8 | 934 |
| 9 | 2088 |
| 10 | 4668 |
| 11 | 10437 |
| 12 | 23337 |
| 13 | 52183 |
| 14 | 116684 |
| 15 | 260913 |
| 16 | 583419 |
| 17 | 1304564 |
| 18 | 2917093 |
| 19 | 6522818 |
| 20 | 14585464 |
| 21 | 32614088 |
| 22 | 72927317 |
| 23 | 163070438 |
| 24 | 364636584 |
| 25 | 815352188 |
| 26 | 1823182917 |
| 27 | 4076760937 |
| 28 | 9115914583 |