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.
?OddQ]<=1&]],{n,0,30}] (* _Gus Wiseman's wiki page.
?OddQ]<=1&]],{n,0,30}] (* _Gus Wiseman has authored 0 sequences.