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 A070643 #3 May 11 2007 03:00:00 %S A070643 0,1,4,9,16,5,16,9,4,1,0,1,4,9,16,5,16,9,4,1,0,1,4,9,16,5,16,9,4,1,0,1 %N A070643 Duplicate of A070442. %K A070643 dead %O A070643 0,3