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 | 64 |
3 | -207360000 |
4 | 15161366937600000000 |
5 | -16026514807440384000000000000000000000000 |
6 | 9186394651457723405912022826165758590976000000000000000000000000 |