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 A026194 #4 Mar 30 2012 18:56:05 %S A026194 1,2,3,5,6,8,9,11,4,14,15,17,18,20,7,23,24,26,27,29,10,32,33,35,12,38, %T A026194 13,41,42,44,45,47,16,50,51,53,54,56,19,59,60,62,21,65,22,68,69,71,72, %U A026194 74,25,77,78,80,81,83,28,86,87,89,30,92,31 %N A026194 a(n) = (1/4)*s(n), where s(n) is the n-th multiple of 4 in A026142. %K A026194 nonn %O A026194 1,2 %A A026194 _Clark Kimberling_