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 A175927 #17 Mar 25 2015 14:04:29 %S A175927 1,2,11,20,40,68,92,212,236,253,266,321,328,452,582 %N A175927 Duplicate of A116990. %K A175927 dead %O A175927 1,2 %A A175927 _Zak Seidov_, Oct 19 2010