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%I #10 May 01 2022 01:38:22
%S 4,12,36,144,276,2124,2796,17760,44184,263004,419868,4278000,5593996,
%T 44748804,134390724,539036160,1073758356,11453725416,15271054956,
%U 137575549680,366528035564,1759219864020,3198580043436
%N Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of four different symbols.
%C See A056371 for an explanation of step shifts.
%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 a(n) = Sum_{d|n} mu(d)*A056373(n/d).
%Y Cf. A056371, A056373.
%K nonn
%O 1,1
%A _Marks R. Nester_
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