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 | 4 |
| 3 | 12 |
| 4 | 31 |
| 5 | 74 |
| 6 | 169 |
| 7 | 376 |
| 8 | 823 |
| 9 | 1782 |
| 10 | 3829 |
| 11 | 8180 |
| 12 | 17395 |
| 13 | 36850 |
| 14 | 77809 |
| 15 | 163824 |
| 16 | 344047 |
| 17 | 720878 |
| 18 | 1507309 |
| 19 | 3145708 |
| 20 | 6553579 |
| 21 | 13631466 |
| 22 | 28311529 |
| 23 | 58720232 |
| 24 | 121634791 |
| 25 | 251658214 |
| 26 | 520093669 |
| 27 | 1073741796 |
| 28 | 2214592483 |
| 29 | 4563402722 |