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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 27 |
| 5 | 130 |
| 6 | 863 |
| 7 | 7554 |
| 8 | 84385 |
| 9 | 1165814 |
| 10 | 19408513 |
| 11 | 381328184 |
| 12 | 8690396907 |
| 13 | 226500350374 |
| 14 | 6671888768963 |
| 15 | 219904832427160 |
| 16 | 8040978338951561 |
| 17 | 323784549401655250 |
| 18 | 14264968083112608087 |