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 | 7 |
| 2 | 15 |
| 3 | 29 |
| 4 | 59 |
| 5 | 117 |
| 6 | 235 |
| 7 | 469 |
| 8 | 939 |
| 9 | 1877 |
| 10 | 3755 |
| 11 | 7509 |
| 12 | 15019 |
| 13 | 30037 |
| 14 | 60075 |
| 15 | 120149 |
| 16 | 240299 |
| 17 | 480597 |
| 18 | 961195 |
| 19 | 1922389 |
| 20 | 3844779 |
| 21 | 7689557 |
| 22 | 15379115 |
| 23 | 30758229 |
| 24 | 61516459 |
| 25 | 123032917 |
| 26 | 246065835 |
| 27 | 492131669 |
| 28 | 984263339 |
| 29 | 1968526677 |
| 30 | 3937053355 |
| 31 | 7874106709 |
| 32 | 15748213419 |
| 33 | 31496426837 |