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 | 24 |
| 2 | 104 |
| 3 | 332 |
| 4 | 1202 |
| 5 | 4158 |
| 6 | 14308 |
| 7 | 48460 |
| 8 | 162722 |
| 9 | 541744 |
| 10 | 1791504 |
| 11 | 5889586 |
| 12 | 19264864 |
| 13 | 62738690 |
| 14 | 203528858 |
| 15 | 658003018 |
| 16 | 2120809106 |
| 17 | 6816832928 |
| 18 | 21856821554 |
| 19 | 69922091542 |
| 20 | 223229394256 |
| 21 | 711333766468 |
| 22 | 2262803472594 |
| 23 | 7186710244256 |