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 | 2 |
| 3 | 6 |
| 4 | 27 |
| 5 | 289 |
| 6 | 4740 |
| 7 | 128371 |
| 8 | 6115158 |
| 9 | 505971397 |
| 10 | 73890230419 |
| 11 | 19136191954838 |
| 12 | 8704355999401819 |
| 13 | 6908686513461201175 |
| 14 | 9552034660752931158279 |