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Search: id:A056394
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| A056394 |
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Number of step shifted (decimated) sequence structures using a maximum of five different symbols. |
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4
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| 1, 2, 4, 11, 18, 116, 157, 1110, 3076, 21808, 42335, 528612, 859502, 8547036, 31968397, 159716545, 398048506, 5303680564, 8835749347, 99411986634, 331215914028, 1987084129352, 4515860983385, 62095481040014
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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See A056371 for an explanation of step shifts. 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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Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
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CROSSREFS
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Cf. A056374.
Sequence in context: A018625 A123557 A056393 this_sequence A056395 A053031 A018674
Adjacent sequences: A056391 A056392 A056393 this_sequence A056395 A056396 A056397
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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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