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 A127584 #7 Mar 30 2012 16:50:40 %S A127584 3,7,0,2,4,6,8,0,2,4,6,8,0,2,4,6,8,0,2,4,6,8,0,2,4,6,8,0,2,4,6,8,0,2, %T A127584 4,6,8,0,2,4,6,8,0,2,4,6,8,0,1,1,0,5,1,0,9,1,1,3,1,1,7,1,2,1,1,2,5,1, %U A127584 2,9,1,3,3,1,3,7,1,4,1,1,4,5,1,4,9,1,5,3,1,5,7,1,6,1,1,6,5,1,6,9,1,7,3,1,7 %N A127584 A007376(4n+3). %K A127584 nonn,base %O A127584 0,1 %A A127584 _N. J. A. Sloane_, Jul 23 2008