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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 37 |
| 5 | 149 |
| 6 | 630 |
| 7 | 2713 |
| 8 | 11899 |
| 9 | 52789 |
| 10 | 236345 |
| 11 | 1066317 |
| 12 | 4842531 |
| 13 | 22117897 |
| 14 | 101535659 |
| 15 | 468233674 |
| 16 | 2168094625 |
| 17 | 10076216851 |
| 18 | 46986691678 |
| 19 | 219777820957 |
| 20 | 1030892924479 |
| 21 | 4848040645676 |
| 22 | 22853639788127 |
| 23 | 107970205586283 |