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 A024665 #3 Mar 30 2012 18:55:59 %S A024665 1,3,4,6,8,10,11,13,16,18,19,21,23,25,26,28,31,33,34,35,37,39,43,44, %T A024665 46,47,49,51,54,56,57,58,60,62,64,67,68,69,71,73,74,76,80,81,83,85,87, %U A024665 89,90,94,95,97,99,101,102,104,105,110,112,114,116,118,119,120,122,124,127,128,131,134 %N A024665 Positions of even numbers in A003325. %K A024665 nonn %O A024665 1,2 %A A024665 _Clark Kimberling_