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 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 32 |
| 6 | 64 |
| 7 | 128 |
| 8 | 255 |
| 9 | 508 |
| 10 | 1012 |
| 11 | 2016 |
| 12 | 4016 |
| 13 | 8000 |
| 14 | 15936 |
| 15 | 31744 |
| 16 | 63233 |
| 17 | 125958 |
| 18 | 250904 |
| 19 | 499792 |
| 20 | 995568 |
| 21 | 1983136 |
| 22 | 3950336 |
| 23 | 7868928 |
| 24 | 15674623 |
| 25 | 31223288 |
| 26 | 62195672 |
| 27 | 123891552 |
| 28 | 246787536 |
| 29 | 491591936 |
| 30 | 979233536 |