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) |
|---|---|
| 0 | 0 |
| 1 | 24 |
| 2 | 1120 |
| 3 | 33264 |
| 4 | 823680 |
| 5 | 18475600 |
| 6 | 389398464 |
| 7 | 7862853600 |
| 8 | 153876579840 |
| 9 | 2940343837200 |
| 10 | 55138611528000 |
| 11 | 1018383898440480 |
| 12 | 18574619721465600 |
| 13 | 335240928272918304 |
| 14 | 5996573430996184960 |
| 15 | 106438123408375281600 |
| 16 | 1876607120325212706816 |
| 17 | 32891715945378106711440 |