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 A085941 #4 May 11 2007 03:00:00 %S A085941 1,2,4,8,16,32,64,128,256,512,3,6,12,24,48,96,192,384,768,1536,9,18,36 %N A085941 Duplicate of A054842. %K A085941 dead %O A085941 0,2