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%I #6 Mar 30 2012 18:50:37
%S 1,3,2,4,5,8,7,6,9,25,11,15,13,21,12,16,17,18,19,24,14,33,23,20,10,39,
%T 27,28,29,36,31,32,22,51,35,30,37,57,26,48,41,56,43,44,54,69,47,40,49,
%U 50,34,52,53,45,55,42,38,87,59,70,61,93,63,64,65,88,67,68,46
%N a(A086957(n))=A086957(n), a(A086958(n))=A086959(n), a(A086959(n))=A086958(n), see A086956.
%C A self-inverse permutation of natural numbers: a(a(n))=n;
%C a(n) = A086962(A086963(n)) = A086963(A086962(n)).
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y Cf. A086572, A086571.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Jul 25 2003
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