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A056421
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Number of primitive (period n) step cyclic shifted sequences using a maximum of four different symbols.
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2
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4, 6, 16, 45, 72, 404, 456, 2550, 5144, 26880, 38568, 367170, 431776, 3202964, 8993712, 33857520, 63177816, 636456776, 803796696, 6886253964, 17456593904, 79965511980, 139069427016, 1466861335900
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OFFSET
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1,1
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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.
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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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