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 A094513 #10 Nov 30 2014 03:33:26 %S A094513 1,2,8,16,4,3,5,32,9,10,6,18,7,17,11,64,20,24,12,33,14,19,13,34,21,22, %T A094513 15,25,23,26,27,128,36,40,35,48,37,38,28,65,41,42,30,44,39,43,29,68, %U A094513 49,50,45,66,46,56,31,72,51,52,47,53,54,55,57,256,80,96,67,129,69,74 %N A094513 A094511(A094511(n)). %C A094513 Permutation of the natural numbers: A094514(a(n))=a(A094514(n))=n; %C A094513 A094512(a(n))=a(A094512(n))=A094511(n). %H A094513 Reinhard Zumkeller, <a href="/A094513/b094513.txt">Table of n, a(n) for n = 1..10000</a> %H A094513 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A094513 (Haskell) %o A094513 a094513 = a094511 . a094511 -- _Reinhard Zumkeller_, Nov 23 2014 %Y A094513 Cf. A007088, A000120. %Y A094513 Cf. A094514 (inverse), A094511, A094512. %K A094513 nonn %O A094513 1,2 %A A094513 _Reinhard Zumkeller_, May 06 2004