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 | 4 |
| 1 | 6 |
| 2 | 10 |
| 3 | 22 |
| 4 | 46 |
| 5 | 93 |
| 6 | 202 |
| 7 | 407 |
| 8 | 849 |
| 9 | 1774 |
| 10 | 3693 |
| 11 | 7671 |
| 12 | 15999 |
| 13 | 33146 |
| 14 | 68703 |
| 15 | 142682 |
| 16 | 295003 |
| 17 | 610757 |
| 18 | 1261573 |
| 19 | 2603453 |
| 20 | 5369633 |
| 21 | 11058907 |
| 22 | 22758881 |
| 23 | 46796443 |
| 24 | 96132103 |
| 25 | 197329777 |
| 26 | 404737537 |
| 27 | 829538129 |
| 28 | 1698995201 |
| 29 | 3477431507 |
| 30 | 7113030933 |
| 31 | 14540737711 |