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.
?IntegerQ][[1]]], AppendTo[s, i]; k++]; s]; seq[1200] (* _Amiram Eldar's wiki page.
?IntegerQ][[1]]], AppendTo[s, i]; k++]; s]; seq[1200] (* _Amiram Eldar has authored 0 sequences.