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 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 12 |
| 6 | 23 |
| 7 | 46 |
| 8 | 97 |
| 9 | 212 |
| 10 | 481 |
| 11 | 1124 |
| 12 | 2705 |
| 13 | 6682 |
| 14 | 16919 |
| 15 | 43840 |
| 16 | 116087 |
| 17 | 313764 |
| 18 | 864683 |
| 19 | 2427306 |
| 20 | 6934769 |
| 21 | 20148124 |
| 22 | 59486997 |
| 23 | 178364624 |
| 24 | 542790609 |
| 25 | 1675526482 |
| 26 | 5243746235 |
| 27 | 16630136364 |
| 28 | 53422028679 |
| 29 | 173754047228 |