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 A071664 #5 Apr 30 2014 01:53:48
%S A071664 0,1,3,2,8,5,6,7,4,22,13,15,18,10,19,11,20,21,12,14,16,17,9,64,36,41,
%T A071664 50,27,52,29,55,59,32,38,47,46,24,60,33,39,48,25,61,34,62,63,35,40,43,
%U A071664 49,26,51,28,53,56,30,54,57,58,31,37,42,44,45,23,196,106,120,148,78
%N A071664 Permutation A057506 applied three times ("cubed").
%H A071664 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 A071664 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y A071664 Inverse permutation: A071663 and also its car/cdr-flipped conjugate, i.e. A071664(n) = A057163(A071663(A057163(n))) = A057506(A071662(n)). Cf. also A071666, A071668, A071670.
%K A071664 nonn
%O A071664 0,3
%A A071664 _Antti Karttunen_, May 30 2002