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 | 12 |
| 1 | 25 |
| 2 | 51 |
| 3 | 103 |
| 4 | 207 |
| 5 | 415 |
| 6 | 831 |
| 7 | 1663 |
| 8 | 3327 |
| 9 | 6655 |
| 10 | 13311 |
| 11 | 26623 |
| 12 | 53247 |
| 13 | 106495 |
| 14 | 212991 |
| 15 | 425983 |
| 16 | 851967 |
| 17 | 1703935 |
| 18 | 3407871 |
| 19 | 6815743 |
| 20 | 13631487 |
| 21 | 27262975 |
| 22 | 54525951 |
| 23 | 109051903 |
| 24 | 218103807 |
| 25 | 436207615 |
| 26 | 872415231 |
| 27 | 1744830463 |
| 28 | 3489660927 |
| 29 | 6979321855 |
| 30 | 13958643711 |