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Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of four different symbols.
2

%I #6 Aug 22 2017 20:53:11

%S 1,1,3,9,16,102,130,800,1889,11089,17598,179255,233448,1865925,

%T 5603767,22468480,44744046,477260541,636308684,5732446015,15272176563,

%U 73301037291,133274359128,1466413083360

%N Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of four 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)*A056393(n/d) where d|n.

%Y Cf. A056383.

%K nonn

%O 1,3

%A _Marks R. Nester_