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%I #6 Aug 22 2017 20:53:11
%S 1,1,3,9,17,112,160,1182,3526,27550,60332,863283,1636608,19121869,
%T 84580104,501914374,1492170608,23751681540,47340359590,637742792823,
%U 2546703019081,18317620779149,49923584451714
%N Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of six different symbols.
%C See A056371 for an explanation of step shifts. Permuting the symbols 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)*A056395(n/d) where d|n.
%Y Cf. A056385.
%K nonn
%O 1,3
%A _Marks R. Nester_
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