Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #6 Apr 09 2023 23:07:46
%S 0,1,2,3,4,5,6,7,9,8,11,10,12,13,14,15,19,18,17,16,22,23,20,21,25,24,
%T 27,26,28,29,30,31,38,39,36,37,35,34,33,32,44,45,46,47,41,40,43,42,51,
%U 50,49,48,54,55,52,53,57,56,59,58,60,61,62,63,76,77,78,79,73,72,75,74,70
%N a(n) = A180200(A180200(n)).
%C Permutation of the natural numbers with inverse A180199;
%C a(A180201(n)) = A180201(a(n)) = A180200(n);
%C a(A075427(n)) = A075427(n).
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y Cf. A075427, A180199, A180200, A180201.
%K nonn
%O 0,3
%A _Reinhard Zumkeller_, Aug 15 2010