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 A030389 #4 Mar 30 2012 18:56:18 %S A030389 2,8,13,15,16,17,19,24,34,46,53,56,58,59,62,70,78,81,82,84,87,90,93, %T A030389 94,96,99,101,102,104,105,106,107,108,110,111,114,117,118,120,123,130, %U A030389 142,149,152,154,155,158,166,180,196,205,209,212 %N A030389 Position of n-th 2 in A030386. %K A030389 nonn %O A030389 1,1 %A A030389 _Clark Kimberling_