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 | 1 |
2 | 20160 |
3 | 1814811575069725360128000000 |
4 | 5286955507745173504309724555631728366786063173939383008283412265633946009600000000000000 |