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 | 5 |
| 3 | 40 |
| 4 | 342 |
| 5 | 2941 |
| 6 | 25333 |
| 7 | 218659 |
| 8 | 1891683 |
| 9 | 16403283 |
| 10 | 142548639 |
| 11 | 1241293314 |
| 12 | 10829045472 |
| 13 | 94632148659 |
| 14 | 828235716571 |
| 15 | 7258991679448 |
| 16 | 63701900660206 |
| 17 | 559673483274827 |
| 18 | 4922447330226279 |
| 19 | 43336501329817600 |
| 20 | 381873520840930490 |
| 21 | 3367815295820010367 |
| 22 | 29724409053210972087 |