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.
?(Max[#] - Min[#] <= 2 &)], {n, 30}] (* _Birkas Gyorgy's wiki page.
?(Max[#] - Min[#] <= 2 &)], {n, 30}] (* _Birkas Gyorgy has authored 0 sequences.