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 A243501 #8 Jul 29 2014 13:48:25 %S A243501 2,4,6,10,8,16,12,28,26,22,14,46,18,34,36,82,20,76,24,64,56,40,30,136, %T A243501 50,52,126,100,32,106,38,244,66,58,78,226,42,70,86,190,44,166,48,118, %U A243501 176,88,54,406,122,148,96,154,60,376,92,298,116,94,62,316,68,112,276,730,120 %N A243501 Permutation of even numbers: a(n) = 2*A048673(n). %H A243501 Antti Karttunen, <a href="/A243501/b243501.txt">Table of n, a(n) for n = 1..10001</a> %F A243501 a(n) = 2*A048673(n). %F A243501 a(n) = A003961(n) + 1. %F A243501 a(n) = A243502(A245447(n)). %o A243501 (Scheme, two different versions) %o A243501 (define (A243501 n) (+ 1 (A003961 n))) %o A243501 (define (A243501v2 n) (* 2 (A048673 n))) %Y A243501 Cf. A243502, A245447, A245448, A244319, A245605-A245606, A245607-A245608. %K A243501 nonn %O A243501 1,1 %A A243501 _Antti Karttunen_, Jul 21 2014