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 | 5 |
| 2 | 14 |
| 3 | 34 |
| 4 | 78 |
| 5 | 174 |
| 6 | 382 |
| 7 | 830 |
| 8 | 1790 |
| 9 | 3838 |
| 10 | 8190 |
| 11 | 17406 |
| 12 | 36862 |
| 13 | 77822 |
| 14 | 163838 |
| 15 | 344062 |
| 16 | 720894 |
| 17 | 1507326 |
| 18 | 3145726 |
| 19 | 6553598 |
| 20 | 13631486 |
| 21 | 28311550 |
| 22 | 58720254 |
| 23 | 121634814 |
| 24 | 251658238 |
| 25 | 520093694 |
| 26 | 1073741822 |
| 27 | 2214592510 |
| 28 | 4563402750 |