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) |
|---|---|
| 0 | 511 |
| 1 | 15887 |
| 2 | 116275 |
| 3 | 412245 |
| 4 | 693418 |
| 5 | 3165290 |
| 6 | 12603032 |
| 7 | 21139155 |
| 8 | 38803550 |
| 9 | 201349286 |
| 10 | 336626733 |
| 11 | 609260174 |
| 12 | 3221261509 |
| 13 | 5374090380 |
| 14 | 25769843817 |
| 15 | 43016936625 |
| 16 | 78384372260 |
| 17 | 412317013686 |
| 18 | 687266122367 |
| 19 | 1238028666383 |