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 A249720 #5 Nov 14 2014 12:39:46 %S A249720 10,16,28,30,32,34,40,46,48,50,52,64,70,82,84,86,88,90,92,94,96,98, %T A249720 100,102,104,106,112,118,120,122,124,130,136,138,140,142,144,146,148, %U A249720 150,152,154,156,158,160,172,178,190,192,194,196,202,208,210,212,214,226,232,244,246,248,250,252,254,256 %N A249720 a(n) = 2 * A249719(n). %C A249720 Gives the positions of odd terms in A249733. %H A249720 Antti Karttunen, <a href="/A249720/b249720.txt">Table of n, a(n) for n = 1..10000</a> %F A249720 a(n) = 2 * A249719(n). %o A249720 (Scheme) (define (A249720 n) (* 2 (A249719 n))) %Y A249720 Cf. A249719, A249733. %K A249720 nonn %O A249720 1,1 %A A249720 _Antti Karttunen_, Nov 14 2014