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 A076939 #3 May 11 2007 03:00:00 %S A076939 1,1,2,2,4,4,8,8,16,16,32,32,64,64,128,128,256,256,512,512,1024,1024 %N A076939 Duplicate of A016116. %K A076939 dead %O A076939 1,3