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Search: id:A056395
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| A056395 |
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Number of step shifted (decimated) sequence structures using a maximum of six different symbols. |
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3
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| 1, 2, 4, 11, 18, 117, 161, 1193, 3530, 27569, 60333, 863409, 1636609, 19122031, 84580125, 501915567, 1492170609, 23751685183, 47340359591, 637742820401, 2546703019245, 18317620839483, 49923584451715
(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. A056375.
Sequence in context: A123557 A056393 A056394 this_sequence A053031 A018674 A076518
Adjacent sequences: A056392 A056393 A056394 this_sequence A056396 A056397 A056398
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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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