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 | 1 |
| 1 | 4 |
| 2 | 80 |
| 3 | 3552 |
| 4 | 271104 |
| 5 | 31342080 |
| 6 | 5087692800 |
| 7 | 1102119137280 |
| 8 | 307098445086720 |
| 9 | 107024623079915520 |
| 10 | 45623072462929920000 |
| 11 | 23361142846626437529600 |
| 12 | 14152553458020435728793600 |
| 13 | 10014464602019135560561459200 |
| 14 | 8186110540477899728656269312000 |