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 A031118 #4 Mar 30 2012 18:56:21 %S A031118 12,32,35,42,49,51,56,80,95,111,119,121,123,130,141,173,185,195,208, %T A031118 220,223,229,235,245,257,268,271,311,323,324,325,342,348,354,379,393, %U A031118 401,418,446,449,459,464,465,466,487,488,496,507 %N A031118 Position of n-th 6 in A031111. %K A031118 nonn %O A031118 1,1 %A A031118 _Clark Kimberling_