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A056426
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Number of primitive (period n) step cyclic shifted sequences using exactly four different symbols.
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1
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0, 0, 0, 3, 12, 136, 204, 1434, 3520, 20688, 31956, 317374, 390364, 2973332, 8504708, 32469954, 61276740, 622084744, 790198476, 6798276744, 17290257884, 79394924652, 138325216092, 1460955163540
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OFFSET
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1,4
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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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