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 | 5 |
| 3 | 14 |
| 4 | 40 |
| 5 | 121 |
| 6 | 383 |
| 7 | 1255 |
| 8 | 4298 |
| 9 | 15340 |
| 10 | 57061 |
| 11 | 221205 |
| 12 | 893281 |
| 13 | 3752361 |
| 14 | 16375447 |
| 15 | 74113910 |
| 16 | 347258809 |
| 17 | 1681355627 |
| 18 | 8397528329 |
| 19 | 43191571794 |
| 20 | 228416030275 |
| 21 | 1240264188677 |
| 22 | 6905550017714 |
| 23 | 39379283772943 |
| 24 | 229752403826530 |