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 A024615 #3 Mar 30 2012 18:55:58 %S A024615 3,8,13,15,22,24,29,32,34,40,42,47,52,54,57,62,67,69,71,78,79,81,85, %T A024615 90,97,99,104,109,113,115,118,119,123,130,133,136,139,145,151,153,157, %U A024615 161,162,168 %N A024615 Positions of even numbers in A024614. %K A024615 nonn %O A024615 1,1 %A A024615 _Clark Kimberling_