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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 17 |
| 5 | 41 |
| 6 | 107 |
| 7 | 274 |
| 8 | 693 |
| 9 | 1766 |
| 10 | 4504 |
| 11 | 11465 |
| 12 | 29194 |
| 13 | 74364 |
| 14 | 189391 |
| 15 | 482327 |
| 16 | 1228412 |
| 17 | 3128559 |
| 18 | 7967841 |
| 19 | 20292639 |
| 20 | 51681711 |
| 21 | 131623900 |
| 22 | 335222103 |
| 23 | 853749852 |
| 24 | 2174345752 |
| 25 | 5537663377 |
| 26 | 14103422348 |
| 27 | 35918853952 |
| 28 | 91478793557 |
| 29 | 232979863277 |
| 30 | 593357374262 |