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Search: id:A056445
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| A056445 |
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Number of primitive (period n) step cyclic shifted sequence structures using exactly three different symbols. |
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+0
1
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| 0, 0, 1, 2, 3, 13, 11, 50, 71, 271, 281, 2139, 1741, 9639, 20452, 58019, 79293, 599367, 566739, 3667942, 6931300, 23775873, 31008623, 246106846, 282422549, 1357817329, 2615067894, 11358094490
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OFFSET
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1,4
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COMMENT
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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.
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FORMULA
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A056440(n)-A056439(n).
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CROSSREFS
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Cf. A056425.
Sequence in context: A132365 A129671 A117684 this_sequence A100385 A128460 A101541
Adjacent sequences: A056442 A056443 A056444 this_sequence A056446 A056447 A056448
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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