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 | 2 |
| 3 | 6 |
| 4 | 15 |
| 5 | 38 |
| 6 | 97 |
| 7 | 247 |
| 8 | 629 |
| 9 | 1602 |
| 10 | 4080 |
| 11 | 10391 |
| 12 | 26464 |
| 13 | 67399 |
| 14 | 171653 |
| 15 | 437169 |
| 16 | 1113390 |
| 17 | 2835602 |
| 18 | 7221763 |
| 19 | 18392518 |
| 20 | 46842401 |
| 21 | 119299083 |
| 22 | 303833085 |
| 23 | 773807654 |
| 24 | 1970747476 |
| 25 | 5019135691 |
| 26 | 12782826512 |
| 27 | 32555536191 |
| 28 | 82913034585 |