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 | 8 |
| 3 | 44 |
| 4 | 298 |
| 5 | 2358 |
| 6 | 21154 |
| 7 | 211100 |
| 8 | 2313030 |
| 9 | 27566654 |
| 10 | 354806116 |
| 11 | 4903884712 |
| 12 | 72444584732 |
| 13 | 1139381007880 |
| 14 | 19012236634968 |
| 15 | 335560664081388 |
| 16 | 6247230709277958 |
| 17 | 122375974186267566 |
| 18 | 2516528486416495240 |