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 | 7 |
| 1 | 16 |
| 2 | 34 |
| 3 | 70 |
| 4 | 142 |
| 5 | 286 |
| 6 | 574 |
| 7 | 1150 |
| 8 | 2302 |
| 9 | 4606 |
| 10 | 9214 |
| 11 | 18430 |
| 12 | 36862 |
| 13 | 73726 |
| 14 | 147454 |
| 15 | 294910 |
| 16 | 589822 |
| 17 | 1179646 |
| 18 | 2359294 |
| 19 | 4718590 |
| 20 | 9437182 |
| 21 | 18874366 |
| 22 | 37748734 |
| 23 | 75497470 |
| 24 | 150994942 |
| 25 | 301989886 |
| 26 | 603979774 |
| 27 | 1207959550 |
| 28 | 2415919102 |