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 | 0 |
| 3 | 0 |
| 4 | 16 |
| 5 | 1528 |
| 6 | 71328 |
| 7 | 10109856 |
| 8 | 949116288 |
| 9 | 197260755456 |
| 10 | 30713652142080 |
| 11 | 8957030720294400 |
| 12 | 2091857665680783360 |