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 | 9 |
| 2 | 69 |
| 3 | 443 |
| 4 | 3145 |
| 5 | 23066 |
| 6 | 163704 |
| 7 | 1172288 |
| 8 | 8419996 |
| 9 | 60354437 |
| 10 | 432486880 |
| 11 | 3101191209 |
| 12 | 22233839619 |
| 13 | 159387906784 |
| 14 | 1142689244796 |
| 15 | 8192204302737 |
| 16 | 58730805975407 |
| 17 | 421050083127329 |
| 18 | 3018577722454520 |
| 19 | 21640640428753082 |