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 A031014 #4 Mar 30 2012 18:56:19 %S A031014 6,19,33,47,61,75,78,80,82,84,86,88,89,90,109,130,151,172,193,214,218, %T A031014 221,224,227,230,233,235,236,256,277,298,319,340,361,365,368,371,374, %U A031014 377,380,382,383,403,424,445,466,487,508,512 %N A031014 Position of n-th 6 in A031007. %K A031014 nonn %O A031014 1,1 %A A031014 _Clark Kimberling_