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 | 15 |
| 2 | 30 |
| 3 | 59 |
| 4 | 118 |
| 5 | 236 |
| 6 | 473 |
| 7 | 946 |
| 8 | 1892 |
| 9 | 3783 |
| 10 | 7566 |
| 11 | 15133 |
| 12 | 30266 |
| 13 | 60531 |
| 14 | 121062 |
| 15 | 242125 |
| 16 | 484249 |
| 17 | 968498 |
| 18 | 1936997 |
| 19 | 3873993 |
| 20 | 7747987 |
| 21 | 15495974 |
| 22 | 30991948 |
| 23 | 61983895 |
| 24 | 123967790 |
| 25 | 247935580 |
| 26 | 495871161 |
| 27 | 991742322 |
| 28 | 1983484643 |
| 29 | 3966969287 |
| 30 | 7933938573 |
| 31 | 15867877147 |