%I #5 Mar 30 2012 18:51:00
%S 0,1,4,2,3,7,8,9,5,6,12,13,14,15,16,10,11,19,20,21,22,23,24,25,17,18,
%T 28,29,30,31,32,33,34,35,36,26,27,39,40,41,42,43,44,45,46,47,48,49,37,
%U 38,52,53,54,55,56,57,58,59,60,61,62,63,64,50,51,67,68,69,70,71,72,73,74
%N A143052(A143052(n)).
%C Permutation of the natural numbers, inverse: A143053;
%C For n>1: a(A008865(n))=A000290(n),
%C a(A000290(n))=A000290(n)-A005408(n-2).
%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_, Jul 20 2008