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 | 5 |
| 2 | 31 |
| 3 | 211 |
| 4 | 1291 |
| 5 | 7759 |
| 6 | 46649 |
| 7 | 279919 |
| 8 | 1679609 |
| 9 | 10077689 |
| 10 | 60466169 |
| 11 | 362796997 |
| 12 | 2176782317 |
| 13 | 13060693999 |
| 14 | 78364164083 |
| 15 | 470184984569 |
| 16 | 2821109907437 |
| 17 | 16926659444687 |
| 18 | 101559956668403 |
| 19 | 609359740010477 |
| 20 | 3656158440062969 |