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 | 10 |
| 3 | 35 |
| 4 | 118 |
| 5 | 392 |
| 6 | 1297 |
| 7 | 4286 |
| 8 | 14158 |
| 9 | 46763 |
| 10 | 154450 |
| 11 | 510116 |
| 12 | 1684801 |
| 13 | 5564522 |
| 14 | 18378370 |
| 15 | 60699635 |
| 16 | 200477278 |
| 17 | 662131472 |
| 18 | 2186871697 |
| 19 | 7222746566 |
| 20 | 23855111398 |
| 21 | 78788080763 |
| 22 | 260219353690 |
| 23 | 859446141836 |
| 24 | 2838557779201 |