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.
%I A075542 #4 May 11 2007 03:00:00 %S A075542 2,15,36,39,46,54,55,73,102,107,110,118,129,160,164,184,187,194,199 %N A075542 Duplicate of A064113. %K A075542 dead %O A075542 1,1