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.
] -> 1, {l, 19}] (* _Wouter Meeussen's wiki page.
] -> 1, {l, 19}] (* _Wouter Meeussen has authored 0 sequences.