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 A266641 #8 Jan 09 2016 16:07:41 %S A266641 0,1,2,3,4,5,6,11,8,9,10,13,12,7,14,15,32,23,18,35,20,33,26,19,24,29, %T A266641 38,27,28,17,30,37,16,21,34,113,36,41,50,87,40,31,42,77,104,45,110, %U A266641 101,96,25,22,69,68,95,54,47,56,39,86,83,60,59,74,99,92,65,114,97,44,81,70,49,72,89,82,75,88,73,66,121,80,51 %N A266641 Permutation of nonnegative integers: a(n) = A264965(2*n) / 2. %H A266641 Antti Karttunen, <a href="/A266641/b266641.txt">Table of n, a(n) for n = 0..16383</a> %H A266641 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A266641 a(n) = A264965(2*n) / 2. %F A266641 As a composition of related permutations: %F A266641 a(n) = A263272(A057889(n)). %o A266641 (Scheme, two alternative definitions) %o A266641 (define (A266641 n) (/ (A264965 (* 2 n)) 2)) %o A266641 (define (A266641 n) (A263272 (A057889 n))) %Y A266641 Inverse: A266642. %Y A266641 Cf. A057889, A263272, A264965, A265329, A265369, A266635, A266636, A266643, A266644. %K A266641 nonn,base %O A266641 0,3 %A A266641 _Antti Karttunen_, Jan 04 2016