A056349 - OEIS

%I #6 Aug 22 2017 20:53:09

%S 0,0,1,6,18,55,147,405,1083,2961,8043,22182,61278,170883,477910,

%T 1344825,3795750,10757763,30572427,87146139,248991674,713088309,

%U 2046303339,5883410760,16944543792,48879708297

%N Number of primitive (period n) bracelets using exactly three different colored beads.

%C Turning over will not create a new bracelet.

%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)*A056343(n/d) where d|n.

%Y Cf. A056288.

%K nonn

%O 1,4

%A _Marks R. Nester_