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 A024807 #7 Jul 24 2019 02:53:05 %S A024807 2,4,6,8,10,12,14,17,18,20,22,25,26,28,29,32,34,35,38,40,42,43,45,47, %T A024807 49,52,54,56,57,58,60,62,64,66,68,69,72,74,75,77,80,83,85,86,89,91,94, %U A024807 96,99,101,104,106,107,109,111,113,116,118,119,122,124,125,127,129,131,133,135 %N A024807 Positions of odd numbers in A004432. %K A024807 nonn %O A024807 1,1 %A A024807 _Clark Kimberling_ %E A024807 a(56) onward corrected by _Sean A. Irvine_, Jul 23 2019