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 | 6 |
| 2 | 24 |
| 3 | 1104 |
| 4 | 13957632 |
| 5 | 859428866274361344 |
| 6 | 1736323895937560083755071573748292907445157625856 |