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 A026235 #4 Mar 30 2012 18:56:05 %S A026235 1,1,1,1,1,1,1,1,2,3,2,5,3,5,8,13,5,13,5,17,20,21,8,23,28,33,34,39,13, %T A026235 41,13,41,46,49,54,61,17,63,64,67,20,67,21,69,82,85,23,89,90,99,100, %U A026235 105,28,109,112,117,122,123,33,131,34,131,134 %N A026235 a(n) = |s(n) - n|, where s = A026234. %K A026235 nonn %O A026235 1,9 %A A026235 _Clark Kimberling_