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 A065271 #5 May 01 2014 02:42:46 %S A065271 1,3,5,7,9,2,11,15,17,13,19,4,21,6,23,31,33,29,35,27,37,25,39,8,41,10, %T A065271 43,12,45,14,47,63,65,61,67,59,69,57,71,55,73,53,75,51,77,49,79,16,81, %U A065271 18,83,20,85,22,87,24,89,26,91,28,93,30,95,127,129,125,131,123,133,121 %N A065271 A065269 conjugated with A059893, inverse of A065272. %H A065271 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A065271 a(n) = A059893(A065269(A059893(n))) %K A065271 nonn %O A065271 1,2 %A A065271 _Antti Karttunen_, Oct 28 2001