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Search: id:A056446
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| A056446 |
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Number of primitive (period n) step cyclic shifted sequence structures using exactly four different symbols. |
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+0
1
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| 0, 0, 0, 1, 1, 11, 13, 82, 162, 929, 1369, 13718, 16421, 124689, 355792, 1356698, 2555043, 25933641, 32931815, 283329802, 720489742, 3308253663, 5763641923, 60874684720, 93543112675, 600086794431
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OFFSET
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1,6
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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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A056441(n)-A056440(n).
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CROSSREFS
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Cf. A056426.
Sequence in context: A057189 A072580 A116436 this_sequence A023317 A056436 A089824
Adjacent sequences: A056443 A056444 A056445 this_sequence A056447 A056448 A056449
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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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