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 | 1 |
| 2 | 0 |
| 3 | 32 |
| 4 | 240 |
| 5 | 11904 |
| 6 | 533568 |
| 7 | 134217728 |
| 8 | 22741568512 |
| 9 | 16885168208896 |