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.
%3)==1) { my $z = znorder(factorial(($'s wiki page.
%3)==1) { my $z = znorder(factorial(($ has authored 0 sequences.