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.
] -> 0}, 2 ;; -1] (* _Bradley Klee's wiki page.
] -> 0}, 2 ;; -1] (* _Bradley Klee has authored 0 sequences.