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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 46 |
| 8 | 110 |
| 9 | 273 |
| 10 | 684 |
| 11 | 1747 |
| 12 | 4505 |
| 13 | 11763 |
| 14 | 30956 |
| 15 | 82153 |
| 16 | 219437 |
| 17 | 589747 |
| 18 | 1593170 |
| 19 | 4324445 |
| 20 | 11787195 |
| 21 | 32251520 |
| 22 | 88548011 |
| 23 | 243877256 |
| 24 | 673605521 |
| 25 | 1865445693 |
| 26 | 5178574184 |
| 27 | 14408195935 |
| 28 | 40170674295 |
| 29 | 112213616851 |