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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 16 |
| 7 | 45 |
| 8 | 127 |
| 9 | 254 |
| 10 | 717 |
| 11 | 2024 |
| 12 | 4048 |
| 13 | 11427 |
| 14 | 32257 |
| 15 | 64514 |
| 16 | 182115 |
| 17 | 514088 |
| 18 | 1028176 |
| 19 | 2902413 |
| 20 | 8193151 |
| 21 | 16386302 |
| 22 | 46256493 |
| 23 | 130576328 |
| 24 | 261152656 |
| 25 | 737201475 |
| 26 | 2081028097 |
| 27 | 4162056194 |
| 28 | 11748967107 |
| 29 | 33165873224 |
| 30 | 66331746448 |