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A056443
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Number of primitive (period n) step cyclic shifted sequence structures using a maximum of six different symbols.
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1
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1, 1, 2, 5, 7, 33, 35, 212, 449, 2991, 5651, 74919, 126757, 1370979, 5653844, 31440622, 87796361, 1319721998, 2491714133, 31893714060, 121274777190, 832622957033, 2170594048581, 34308978905916
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OFFSET
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1,3
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COMMENTS
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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.
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REFERENCES
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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]
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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