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 | 0 |
| 4 | 8 |
| 5 | 1408 |
| 6 | 1106016 |
| 7 | 27605259264 |
| 8 | 3564317860276224 |
| 9 | 28463849350128000663552 |