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%I #10 Aug 22 2017 20:53:08
%S 6,15,120,645,3990,23295,140610,839790,5042610,30232965,181421850,
%T 1088390415,6530486970,39182081385,235093327980,1410554953080,
%U 8463334761210,50779978307010,304679900238330
%N Number of primitive (aperiodic) reversible strings with n beads using a maximum of six different colors.
%C A string and its reverse are considered to be equivalent.
%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)*A056308(n/d) where d|n.
%Y Column 6 of A284871.
%Y Cf. A045625.
%K nonn
%O 1,1
%A _Marks R. Nester_