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 Mar 30 2012 18:50:19
%S 1,3,2,5,4,7,6,8,10,9,12,11,16,13,18,14,22,15,28,17,30,19,36,20,40,21,
%T 42,23,46,24,52,25,58,26,60,27,66,29,70,31,72,32,78,33,82,34,88,35,96,
%U 37,100,38,102,39,106,41,108,43,112,44,126,45,130,47,136,48,138,49,148
%N Inverse permutation to A066250.
%C Permutation of natural numbers.
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F a(n) = (if n is odd then A000040((n+1)/2) else A002808(n/2)) - 1.
%Y Cf. A066250, A000040, A002808, A066248, A066255.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Dec 09 2001