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 | 4 |
| 4 | 10 |
| 5 | 27 |
| 6 | 85 |
| 7 | 262 |
| 8 | 873 |
| 9 | 2917 |
| 10 | 10011 |
| 11 | 34561 |
| 12 | 120815 |
| 13 | 424468 |
| 14 | 1501441 |
| 15 | 5334181 |
| 16 | 19035075 |
| 17 | 68167472 |
| 18 | 244928324 |
| 19 | 882555803 |
| 20 | 3188480899 |
| 21 | 11546307356 |
| 22 | 41901879156 |
| 23 | 152359984459 |
| 24 | 554991766194 |
| 25 | 2024964145507 |