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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 5 |
| 7 | 10 |
| 8 | 20 |
| 9 | 42 |
| 10 | 86 |
| 11 | 178 |
| 12 | 362 |
| 13 | 738 |
| 14 | 1490 |
| 15 | 3010 |
| 16 | 6050 |
| 17 | 12162 |
| 18 | 24386 |
| 19 | 48898 |
| 20 | 97922 |
| 21 | 196098 |
| 22 | 392450 |
| 23 | 785410 |
| 24 | 1571330 |
| 25 | 3143682 |
| 26 | 6288386 |