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 | 9 |
| 4 | 30 |
| 5 | 103 |
| 6 | 372 |
| 7 | 1379 |
| 8 | 5248 |
| 9 | 20356 |
| 10 | 80252 |
| 11 | 320581 |
| 12 | 1295018 |
| 13 | 5280967 |
| 14 | 21711163 |
| 15 | 89890559 |
| 16 | 374478935 |
| 17 | 1568585095 |
| 18 | 6602283315 |
| 19 | 27910296899 |
| 20 | 118448905668 |
| 21 | 504466997897 |
| 22 | 2155412350793 |
| 23 | 9236401247438 |
| 24 | 39686616306747 |
| 25 | 170946789568804 |
| 26 | 738024717474360 |