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 | 2 |
2 | 1081600 |
3 | 528465082730906880000 |
4 | 29276520893554373473343522853366005760000000000 |
5 | 5719545329208791496596894540018824083491259163047733746620041978183680000000000000000 |