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) |
|---|---|
| 7 | 720 |
| 8 | 17640 |
| 9 | 258720 |
| 10 | 2963520 |
| 11 | 29317680 |
| 12 | 263506320 |
| 13 | 2215825920 |
| 14 | 17758540440 |
| 15 | 137337087888 |
| 16 | 1033793011440 |
| 17 | 7621696948320 |
| 18 | 55289495222640 |
| 19 | 396017903136240 |
| 20 | 2808175618022544 |
| 21 | 19754629731587280 |
| 22 | 138087381577881960 |
| 23 | 960370246763096400 |
| 24 | 6652267408747194360 |