%I #6 Aug 22 2017 20:53:10
%S 2,2,4,8,10,32,26,84,98,266,214,1200,702,2770,4328,8832,8230,44086,
%T 29202,135744,176720,419654,381490,2149068,1678244,5593294,7461064,
%U 22550600,19175158,134386396,71585134
%N Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of two 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 Sum mu(d)*A056371(n/d) where d divides n.
%K nonn
%O 1,1
%A _Marks R. Nester_