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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 8 |
| 5 | 19 |
| 6 | 39 |
| 7 | 82 |
| 8 | 166 |
| 9 | 337 |
| 10 | 677 |
| 11 | 1360 |
| 12 | 2724 |
| 13 | 5455 |
| 14 | 10915 |
| 15 | 21838 |
| 16 | 43682 |
| 17 | 87373 |
| 18 | 174753 |
| 19 | 349516 |
| 20 | 699040 |
| 21 | 1398091 |
| 22 | 2796191 |
| 23 | 5592394 |
| 24 | 11184798 |
| 25 | 22369609 |
| 26 | 44739229 |
| 27 | 89478472 |
| 28 | 178956956 |
| 29 | 357913927 |
| 30 | 715827867 |
| 31 | 1431655750 |
| 32 | 2863311514 |