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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 34 |
| 7 | 92 |
| 8 | 277 |
| 9 | 806 |
| 10 | 2500 |
| 11 | 7578 |
| 12 | 24198 |
| 13 | 75370 |
| 14 | 243800 |
| 15 | 776494 |
| 16 | 2545777 |
| 17 | 8223352 |
| 18 | 27221690 |
| 19 | 88984144 |
| 20 | 296856400 |
| 21 | 979829772 |
| 22 | 3287985078 |
| 23 | 10934749788 |
| 24 | 36912408342 |
| 25 | 123519937044 |
| 26 | 418650924886 |
| 27 | 1408867195252 |
| 28 | 4794243983204 |
| 29 | 16205061000480 |