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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 19 |
| 5 | 42 |
| 6 | 99 |
| 7 | 208 |
| 8 | 443 |
| 9 | 906 |
| 10 | 1853 |
| 11 | 3780 |
| 12 | 7595 |
| 13 | 15246 |
| 14 | 30537 |
| 15 | 61160 |
| 16 | 122413 |
| 17 | 244930 |
| 18 | 489985 |
| 19 | 980080 |
| 20 | 1960257 |
| 21 | 3920646 |
| 22 | 7841419 |
| 23 | 15682972 |
| 24 | 31366187 |
| 25 | 62732582 |
| 26 | 125465509 |
| 27 | 250931320 |
| 28 | 501863047 |
| 29 | 1003726454 |
| 30 | 2007453193 |
| 31 | 4014906880 |
| 32 | 8029814297 |