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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 15 |
| 6 | 49 |
| 7 | 169 |
| 8 | 602 |
| 9 | 2191 |
| 10 | 8095 |
| 11 | 30239 |
| 12 | 113906 |
| 13 | 431886 |
| 14 | 1646177 |
| 15 | 6301715 |
| 16 | 24210652 |
| 17 | 93299841 |
| 18 | 360490592 |
| 19 | 1396030396 |
| 20 | 5417028610 |
| 21 | 21056764914 |
| 22 | 81978913225 |
| 23 | 319610939055 |
| 24 | 1247641114021 |
| 25 | 4875896455975 |
| 26 | 19075294462185 |
| 27 | 74696636715792 |
| 28 | 292758662041150 |