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%I #6 Mar 30 2012 18:50:53

%S 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,21,23,19,25,18,27,20,29,

%T 22,26,28,24,30,31,32,33,41,35,43,45,37,47,39,49,34,42,36,44,46,38,48,

%U 40,61,51,63,53,65,67,55,69,57,58,59,60,50,62,64,52,81,54,83,56,85,71,87

%N A113220(A113220(n)).

%C Inverse integer permutation of T000004;

%C A113218(a(n)) = a(A113218(n)) = A113220(n).

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%K nonn

%O 0,3

%A _Reinhard Zumkeller_, Oct 18 2005