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 | 5 |
| 3 | 12 |
| 4 | 29 |
| 5 | 68 |
| 6 | 155 |
| 7 | 348 |
| 8 | 775 |
| 9 | 1712 |
| 10 | 3745 |
| 11 | 8112 |
| 12 | 17431 |
| 13 | 37252 |
| 14 | 79355 |
| 15 | 168710 |
| 16 | 358037 |
| 17 | 758020 |
| 18 | 1599675 |
| 19 | 3362876 |
| 20 | 7041593 |
| 21 | 14692956 |
| 22 | 30577435 |
| 23 | 63531092 |
| 24 | 131901879 |
| 25 | 273804738 |
| 26 | 568366037 |
| 27 | 1179585610 |
| 28 | 2446603047 |
| 29 | 5068970880 |