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 | 21 |
| 1 | 21 |
| 2 | 21 |
| 3 | 42 |
| 4 | 42 |
| 5 | 42 |
| 6 | 84 |
| 7 | 84 |
| 8 | 84 |
| 9 | 168 |
| 10 | 168 |
| 11 | 168 |
| 12 | 336 |
| 13 | 336 |
| 14 | 336 |
| 15 | 672 |
| 16 | 672 |
| 17 | 672 |
| 18 | 1344 |
| 19 | 1344 |
| 20 | 1344 |
| 21 | 2688 |
| 22 | 2688 |
| 23 | 2688 |
| 24 | 5376 |
| 25 | 5376 |
| 26 | 5376 |
| 27 | 10752 |
| 28 | 10752 |
| 29 | 10752 |
| 30 | 21504 |
| 31 | 21504 |
| 32 | 21504 |
| 33 | 43008 |
| 34 | 43008 |
| 35 | 43008 |
| 36 | 86016 |
| 37 | 86016 |
| 38 | 86016 |
| 39 | 172032 |
| 40 | 172032 |
| 41 | 172032 |
| 42 | 344064 |