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 | 9 |
| 4 | 19 |
| 5 | 47 |
| 6 | 98 |
| 7 | 220 |
| 8 | 441 |
| 9 | 885 |
| 10 | 1771 |
| 11 | 3551 |
| 12 | 7106 |
| 13 | 14279 |
| 14 | 28559 |
| 15 | 57121 |
| 16 | 114243 |
| 17 | 228495 |
| 18 | 456994 |
| 19 | 914012 |
| 20 | 1828025 |
| 21 | 3656053 |
| 22 | 7312107 |
| 23 | 14624223 |
| 24 | 29248450 |
| 25 | 58497096 |
| 26 | 116994195 |
| 27 | 233988391 |
| 28 | 467976791 |
| 29 | 935953586 |
| 30 | 1871907196 |