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 A092631 #3 May 11 2007 03:00:00 %S A092631 22,25,27,32,33,35,52,55,57,72,75,77,222,225,232,235,237,252,253,255 %N A092631 Duplicate of A061371. %K A092631 dead %O A092631 1,1