%I #5 Mar 30 2012 18:50:59
%S 1,2,3,4,8,5,10,6,12,14,9,16,18,20,11,24,25,7,13,27,28,15,30,32,33,34,
%T 36,19,21,38,39,40,22,44,45,23,48,50,51,26,52,55,56,57,29,58,31,62,63,
%U 64,17,65,68,35,70,72,37,74,75,77,78,80,41,42,84,85,43,86,87,90,91,46
%N A137621(A137621(n)).
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Jan 30 2008
