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%I #7 Mar 20 2022 21:42:32
%S 1,4,2,3,5,6,7,8,11,12,9,10,13,14,16,17,15,22,18,19,23,24,20,21,25,26,
%T 29,30,27,28,31,32,37,38,33,34,39,40,35,36,41,42,46,47,43,44,48,49,45,
%U 56,50,51,57,58,52,53,59,60,54,55,61,62,67,68,63,64,69,70,65,66,71,72
%N Inverse permutation to A138609.
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y Inverse: A138609.
%K nonn
%O 1,2
%A _Antti Karttunen_, Oct 05 2009