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 | 10 |
| 4 | 28 |
| 5 | 83 |
| 6 | 227 |
| 7 | 626 |
| 8 | 1644 |
| 9 | 4290 |
| 10 | 11322 |
| 11 | 28965 |
| 12 | 74469 |
| 13 | 189436 |
| 14 | 471910 |
| 15 | 1166247 |
| 16 | 2884920 |
| 17 | 7130085 |
| 18 | 17349489 |
| 19 | 42180190 |
| 20 | 101820577 |
| 21 | 242907065 |
| 22 | 579402163 |
| 23 | 1375056009 |
| 24 | 3262651085 |
| 25 | 7768448187 |
| 26 | 18411720785 |