%I A107763
%S A107763 1,1,2,6,12,72,480,864,9600,108000,312000,4795200,46293120,241056000,
%T A107763 4759413120,94182359040,478511953920,4873965022080,122634632171520,
%U A107763 799554193966080,23063946114908160,664424069072117760
%N A107763 Number of ways to arrange the numbers (1,3,5,7,9,...,2n-1) in a circle 
               such that every two adjacent numbers are relatively prime.
%C A107763 Odd analogue of A086595.
%Y A107763 Cf. A076220, A086595, A102381, A107761, A107762.
%Y A107763 Sequence in context: A136240 A090747 A076220 this_sequence A166470 A144144 
               A129085
%Y A107763 Adjacent sequences: A107760 A107761 A107762 this_sequence A107764 A107765 
               A107766
%K A107763 nonn
%O A107763 1,3
%A A107763 Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 11 2005
%E A107763 More terms from Max Alekseyev (maxale(AT)gmail.com), Jun 11 2005