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 A071665 #5 Apr 30 2014 01:53:48
%S A071665 0,1,2,3,4,7,5,6,8,9,17,12,16,21,10,18,11,14,20,13,15,19,22,23,45,31,
%T A071665 44,58,26,49,30,42,57,35,40,56,63,24,46,32,43,59,25,47,28,37,54,48,34,
%U A071665 53,62,27,50,29,38,55,33,39,51,61,36,41,52,60,64,65,129,87,128,170,73
%N A071665 Permutation A057505 applied four times ("^4"), permutation A071661 squared.
%H A071665 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (Includes the complete Scheme source for computing this sequence)
%H A071665 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y A071665 Inverse permutation: A071666 and also its car/cdr-flipped conjugate, i.e. A071665(n) = A057163(A071666(A057163(n))) = A057505(A071663(n)) = A071661(A071661(n)). Cf. also A071667, A071669.
%K A071665 nonn
%O A071665 0,3
%A A071665 _Antti Karttunen_, May 30 2002