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 | 2 |
3 | 12 |
4 | 2520 |
5 | 48348686786400 |
6 | 10543141534556403817127800577537146514577188497111149855093902265479066128013109211427715400552367011213513440000 |