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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 15 |
| 7 | 36 |
| 8 | 81 |
| 9 | 207 |
| 10 | 721 |
| 11 | 2376 |
| 12 | 7507 |
| 13 | 21738 |
| 14 | 73374 |
| 15 | 282743 |
| 16 | 1171196 |
| 17 | 4788339 |
| 18 | 16873326 |
| 19 | 67358487 |
| 20 | 254348771 |
| 21 | 1112160513 |
| 22 | 5501381580 |
| 23 | 28156192351 |
| 24 | 119664751353 |
| 25 | 562988633501 |
| 26 | 2493170384313 |
| 27 | 12700046797629 |
| 28 | 57276361610664 |
| 29 | 296047270811158 |