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 A030607 #4 Mar 30 2012 18:56:19 %S A030607 2,6,7,16,17,24,28,30,36,40,41,50,59,60,63,64,86,89,100,102,108,119, %T A030607 126,133,144,150,154,155,157,158,163,169,172,174,177,181,182,183,189, %U A030607 199,207,209,217,221,223,225,227,230,232,235,253 %N A030607 Position of n-th 2 in A030604. %K A030607 nonn %O A030607 1,1 %A A030607 _Clark Kimberling_