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 | 10 |
| 1 | 21 |
| 2 | 43 |
| 3 | 87 |
| 4 | 175 |
| 5 | 351 |
| 6 | 703 |
| 7 | 1407 |
| 8 | 2815 |
| 9 | 5631 |
| 10 | 11263 |
| 11 | 22527 |
| 12 | 45055 |
| 13 | 90111 |
| 14 | 180223 |
| 15 | 360447 |
| 16 | 720895 |
| 17 | 1441791 |
| 18 | 2883583 |
| 19 | 5767167 |
| 20 | 11534335 |
| 21 | 23068671 |
| 22 | 46137343 |
| 23 | 92274687 |
| 24 | 184549375 |
| 25 | 369098751 |
| 26 | 738197503 |
| 27 | 1476395007 |
| 28 | 2952790015 |