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 | 2304 |
| 4 | 156672 |
| 5 | 2169600 |
| 6 | 15220800 |
| 7 | 72182880 |
| 8 | 264520704 |
| 9 | 806827392 |
| 10 | 2144534400 |
| 11 | 5120913600 |
| 12 | 11222069760 |