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 | 7 |
| 3 | 35 |
| 4 | 147 |
| 5 | 561 |
| 6 | 2013 |
| 7 | 6936 |
| 8 | 23244 |
| 9 | 76434 |
| 10 | 248158 |
| 11 | 799178 |
| 12 | 2561866 |
| 13 | 8197109 |
| 14 | 26236283 |
| 15 | 84147409 |
| 16 | 270824081 |
| 17 | 875656255 |
| 18 | 2846900003 |
| 19 | 9313478684 |
| 20 | 30675454100 |
| 21 | 101762486216 |
| 22 | 340118043072 |
| 23 | 1145518666868 |
| 24 | 3888262008004 |
| 25 | 13301838021901 |