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 | 2674440 |
3 | 141371511060715200 |
4 | 300084647544974128326709244080 |
5 | 63459439063595192178662944522933222953984000 |