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 | 24 |
3 | 122522400 |
4 | 41936006482988380963200 |
5 | 2818633727625754852693848168481445291030176361088000 |