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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 33 |
| 6 | 71 |
| 7 | 151 |
| 8 | 319 |
| 9 | 667 |
| 10 | 1385 |
| 11 | 2855 |
| 12 | 5855 |
| 13 | 11949 |
| 14 | 24299 |
| 15 | 49255 |
| 16 | 99597 |
| 17 | 200967 |
| 18 | 404845 |
| 19 | 814425 |
| 20 | 1636581 |
| 21 | 3285713 |
| 22 | 6591853 |
| 23 | 13216829 |
| 24 | 26487447 |
| 25 | 53062045 |
| 26 | 106265431 |
| 27 | 212759755 |
| 28 | 425890401 |
| 29 | 852381243 |
| 30 | 1705734905 |
| 31 | 3413043757 |
| 32 | 6828635653 |
| 33 | 13661395165 |