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 | 4 |
| 2 | 6 |
| 3 | 17 |
| 4 | 35 |
| 5 | 72 |
| 6 | 241 |
| 7 | 722 |
| 8 | 1821 |
| 9 | 4863 |
| 10 | 14841 |
| 11 | 43444 |
| 12 | 119306 |
| 13 | 335624 |
| 14 | 985356 |
| 15 | 2849009 |
| 16 | 8044468 |
| 17 | 22928355 |
| 18 | 66336411 |
| 19 | 190801483 |
| 20 | 543986757 |
| 21 | 1556622000 |
| 22 | 4478561650 |
| 23 | 12855871827 |
| 24 | 36783013974 |
| 25 | 105393294206 |
| 26 | 302583744944 |
| 27 | 867943015259 |