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%I A179977 #5 Mar 20 2022 21:42:37
%S A179977 1,2,3,4,5,6,7,8,9,17,16,15,14,13,12,11,10,25,26,18,19,20,21,22,23,24,
%T A179977 27,28,29,37,36,35,34,33,32,31,30,45,46,38,39,40,41,42,43,44,47,48,49,
%U A179977 57,56,55,54,53,52,51,50,65,66,58,59,60,61,62,63,64,67,68,69,77,76,75
%N A179977 Inverse permutation to A108971.
%C A179977 a(A108971(n)) = A108971(a(n)) = n;
%C A179977 a(A179978(n)) = A179978(a(n)) = A108971(n).
%K A179977 nonn
%O A179977 1,2
%A A179977 _Reinhard Zumkeller_, Aug 04 2010

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