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 A026202 #4 Mar 30 2012 18:56:05 %S A026202 1,2,4,5,7,3,10,11,13,14,16,6,19,20,22,8,25,9,28,29,31,32,34,12,37,38, %T A026202 40,41,43,15,46,47,49,17,52,18,55,56,58,59,61,21,64,65,67,23,70,24,73, %U A026202 74,76,26,79,27,82,83,85,86,88,30,91,92,94 %N A026202 a(n) = (1/4)*s(n), where s(n) is the n-th multiple of 4 in A026166. %K A026202 nonn %O A026202 1,2 %A A026202 _Clark Kimberling_