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A056416
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Number of step cyclic shifted sequences using exactly three different symbols.
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2
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0, 0, 1, 6, 9, 56, 51, 258, 380, 1500, 1611, 12298, 10245, 57108, 121721, 346146, 474489, 3589534, 3397143, 21984804, 41570773, 142619388, 186027579, 1476414178, 1694455320, 8146633638, 15690141155
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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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