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A056366 Number of primitive (period n) bracelet structures using exactly two different colored beads. 1

%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(n-1).

%Y Column 2 of A276543.

%Y Cf. A056303.

%K nonn

%O 1,4

%A _Marks R. Nester_

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Last modified September 25 06:05 EDT 2020. Contains 337335 sequences. (Running on oeis4.)