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 A026263 #4 Mar 30 2012 18:56:05 %S A026263 1,1,1,1,1,1,1,1,2,3,2,3,3,3,3,4,3,4,5,4,5,4,6,5,6,5,6,7,6,8,6,8,6,8, %T A026263 7,8,9,8,10,8,10,8,10,8,10,9,11,12,10,12,10,12,10,13,10,13,14,11,14, %U A026263 12,15,12,15,12,15,16,13,16,13,17,14,17,14,17 %N A026263 a(n) = |s(n) - n|, where s = A026262. %K A026263 nonn %O A026263 1,9 %A A026263 _Clark Kimberling_