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) == $n-1 } 2..$n-1; } say vecprod(list($'s wiki page.
,$n) == $n-1 } 2..$n-1; } say vecprod(list($ has authored 0 sequences.