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 A169756 #5 Mar 31 2012 13:22:28 %S A169756 1,4,2,7,3,10,19,8,21,6,23,17,9,28,18,39,16,41,14,43,12,45,33,68,31, %T A169756 70,29,15,58,13,60,11,62,46,99,44,26,83,24,85 %N A169756 Similar to A169748, but now A = 1,3,5,7,9,11,..., B = 2,4,6,8,10,12, ... %K A169756 nonn %O A169756 1,2 %A A169756 _Rodolfo Kurchan_, May 04 2010 %E A169756 More terms from _Nathaniel Johnston_, Nov 18 2010