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%I #6 Aug 22 2017 20:53:11
%S 6,15,50,210,456,4220,6960,57330,188810,1518558,3302916,45916780,
%T 83747280,933074430,3920355200,22075393725,62230996500,940379117630,
%U 1781757016320,22856963695482,87052415634120
%N Number of primitive (period n) step cyclic shifted sequences using a maximum of six different symbols.
%C See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are 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)*A056414(n/d) where d|n.
%K nonn
%O 1,1
%A _Marks R. Nester_