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 A054517 #4 May 11 2007 03:00:00 %S A054517 1,2,4,8,16,31,32,64,103,128,171,213,256,301,342,439,475,494,512,558 %N A054517 Duplicate of A054016. %K A054517 dead %O A054517 1,2