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 | 0 |
| 2 | 6 |
| 3 | 6 |
| 4 | 672 |
| 5 | 4734 |
| 6 | 177048 |
| 7 | 4131792 |
| 8 | 132137160 |
| 9 | 4330697670 |
| 10 | 144754955796 |