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 | 5 |
| 3 | 14 |
| 4 | 45 |
| 5 | 139 |
| 6 | 434 |
| 7 | 1351 |
| 8 | 4209 |
| 9 | 13110 |
| 10 | 40837 |
| 11 | 127203 |
| 12 | 396226 |
| 13 | 1234207 |
| 14 | 3844441 |
| 15 | 11975078 |
| 16 | 37301261 |
| 17 | 116189979 |
| 18 | 361921042 |
| 19 | 1127350583 |
| 20 | 3511592833 |
| 21 | 10938286998 |
| 22 | 34071752661 |
| 23 | 106130359315 |
| 24 | 330586256610 |