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A056415
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Number of step cyclic shifted sequences using exactly two different symbols.
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2
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0, 1, 2, 4, 4, 11, 8, 22, 20, 43, 28, 156, 72, 243, 366, 691, 520, 2635, 1608, 7384, 8866, 19399, 16768, 94482, 67560, 216273, 277532, 815556, 662368, 4500265, 2311468, 8466187, 13045106, 31593283, 40937604, 159772174, 103197488, 401913695
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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.
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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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EXTENSIONS
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STATUS
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approved
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