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) |
|---|---|
| 0 | 6 |
| 1 | 4 |
| 2 | 72 |
| 3 | 3528 |
| 4 | 108900 |
| 5 | 12744900 |
| 6 | 3852664200 |
| 7 | 260620460100 |
| 8 | 282251958288300 |