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 | 16 |
| 5 | 32 |
| 6 | 64 |
| 7 | 127 |
| 8 | 251 |
| 9 | 495 |
| 10 | 975 |
| 11 | 1919 |
| 12 | 3775 |
| 13 | 7424 |
| 14 | 14598 |
| 15 | 28702 |
| 16 | 56430 |
| 17 | 110942 |
| 18 | 218110 |
| 19 | 428797 |
| 20 | 842997 |
| 21 | 1657293 |
| 22 | 3258157 |
| 23 | 6405373 |
| 24 | 12592637 |
| 25 | 24756478 |
| 26 | 48669960 |
| 27 | 95682628 |
| 28 | 188107100 |
| 29 | 369808828 |
| 30 | 727025020 |
| 31 | 1429293563 |
| 32 | 2809917167 |
| 33 | 5524151707 |