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 A253885 #6 Jan 18 2015 19:05:29 %S A253885 0,2,4,8,6,14,10,26,24,20,12,44,16,32,34,80,18,74,22,62,54,38,28,134, %T A253885 48,50,124,98,30,104,36,242,64,56,76,224,40,68,84,188,42,164,46,116, %U A253885 174,86,52,404,120,146,94,152,58,374,90,296,114,92,60,314,66,110,274,728,118,194,70,170,144,230,72,674,78,122,244,206,142,254,82 %N A253885 Permutation of even numbers: a(n) = A003961(n+1) - 1. %H A253885 Antti Karttunen, <a href="/A253885/b253885.txt">Table of n, a(n) for n = 0..10000</a> %F A253885 a(n) = A003961(n+1) - 1. %F A253885 a(n) = A243501(n+1) - 2. %o A253885 (Scheme) (define (A253885 n) (- (A003961 (+ n 1)) 1)) %Y A253885 Cf. A003961, A253886, A243501, A246684. %K A253885 nonn %O A253885 0,2 %A A253885 _Antti Karttunen_, Jan 18 2015