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 A030554 #4 Mar 30 2012 18:56:18 %S A030554 5,17,29,41,53,54,56,58,60,62,64,65,83,101,119,137,155,157,160,163, %T A030554 166,169,172,173,191,209,227,245,263,265,268,271,274,277,280,281,299, %U A030554 317,335,353,371,373,376,379,382,385,388,389,407 %N A030554 Position of n-th 5 in A030548. %K A030554 nonn %O A030554 1,1 %A A030554 _Clark Kimberling_