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) |
|---|---|
| 3 | 3 |
| 4 | 45 |
| 5 | 1824 |
| 6 | 109560 |
| 7 | 9520560 |
| 8 | 1145057760 |
| 9 | 181091917440 |