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 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 11 |
| 8 | 25 |
| 9 | 55 |
| 10 | 131 |
| 11 | 310 |
| 12 | 760 |
| 13 | 1856 |
| 14 | 4602 |
| 15 | 11418 |
| 16 | 28572 |
| 17 | 71679 |
| 18 | 180829 |
| 19 | 457633 |
| 20 | 1163061 |
| 21 | 2965132 |
| 22 | 7585112 |
| 23 | 19458697 |
| 24 | 50060307 |
| 25 | 129109859 |
| 26 | 333784289 |
| 27 | 864807439 |
| 28 | 2245261973 |
| 29 | 5840375469 |
| 30 | 15219177003 |