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%I #6 Aug 22 2017 20:53:11
%S 1,2,3,7,8,36,35,201,393,2370,3971,46094,66675,613439,2139350,
%T 10016839,23424253,294723254,465082931,4972761822,15773188813,
%U 90323063945,196342666487,2587522663248,4967200045397,39800811900389
%N Step cyclic shifted sequence structures using a maximum of five different symbols.
%C See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. 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 Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
%Y Cf. A056413.
%K nonn
%O 1,2
%A _Marks R. Nester_