%I
%S 0,1,1,2,3,5,8,14,21,39,62,112,189,352,607,1144,2055,3885,7154,13602,
%T 25472,48670,92204,176770,337590,649341,1246840,2404872,4636389,
%U 8964143,17334800
%N Number of primitive (period n) bracelet structures using exactly two different colored beads.
%C Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure. Identical to A000046 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 A000046(n)A000007(n1).
%Y Column 2 of A276543.
%Y Cf. A056303.
%K nonn
%O 1,4
%A _Marks R. Nester_
