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 | 0 |
| 1 | 1 |
| 2 | 26 |
| 3 | 282 |
| 4 | 2072 |
| 5 | 12279 |
| 6 | 63858 |
| 7 | 305464 |
| 8 | 1382648 |
| 9 | 6029325 |
| 10 | 25628762 |
| 11 | 107026662 |
| 12 | 441439944 |
| 13 | 1804904755 |
| 14 | 7334032754 |
| 15 | 29669499492 |
| 16 | 119647095176 |
| 17 | 481400350185 |
| 18 | 1933747745850 |
| 19 | 7758556171570 |
| 20 | 31102292517560 |
| 21 | 124605486285231 |
| 22 | 498987240470066 |
| 23 | 1997573938402512 |