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 A030610 #4 Mar 30 2012 18:56:19 %S A030610 4,11,18,25,29,32,44,45,52,53,56,67,68,69,76,77,85,106,112,118,120, %T A030610 121,129,151,162,164,167,170,173,190,192,200,205,208,210,215,228,240, %U A030610 241,242,256,258,267,275,277,281,290,291,292,298 %N A030610 Position of n-th 5 in A030604. %K A030610 nonn %O A030610 1,1 %A A030610 _Clark Kimberling_