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%I #6 Aug 22 2017 20:53:09
%S 1,1,3,9,31,112,466,2124,10476,55058,301632,1703989,9819215,57364723,
%T 338134486,2005132504,11937364183,71254885362,426063226936,
%U 2550552259119,15280103806730,91588103894781
%N Number of primitive (aperiodic) reversible string structures with n beads using a maximum of six different colors.
%C A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure.
%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)*A056325(n/d) where d|n.
%Y Cf. A056317.
%K nonn
%O 1,3
%A _Marks R. Nester_
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