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]]+3==#[[4]]&),1,Heads->False]]]+1] (* _Harvey P. Dale's wiki page.
?(#[[1]]+3==#[[4]]&),1,Heads->False]]]+1] (* _Harvey P. Dale has authored 0 sequences.