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%I #6 Aug 22 2017 20:53:09
%S 0,1,2,3,6,8,16,24,42,69,124,208,378,668,1214,2220,4110,7630,14308,
%T 26931,50944,96782,184408,352450,675180,1296477,2493680,4805388,
%U 9272778,17919558,34669600
%N Number of primitive (period n) bracelets using exactly two different colored beads.
%C Turning over will not create a new bracelet. Identical to A001371 for n>1.
%D M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
%F Sum mu(d)*A056342(n/d) where d divides n.
%Y Cf. A001037.
%K nonn
%O 1,3
%A _Marks R. Nester_