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Search: id:A056392
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| A056392 |
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Number of step shifted (decimated) sequence structures using a maximum of three different symbols. |
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4
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| 1, 2, 4, 10, 14, 70, 68, 332, 577, 2510, 2980, 23372, 22218, 133150, 300964, 909382, 1345634, 10767202, 10762820, 72957100, 145362932, 523029526, 713213956, 5893709440, 7060765733, 35303782550
(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. A056372.
Sequence in context: A081115 A053417 A078775 this_sequence A080149 A128513 A048200
Adjacent sequences: A056389 A056390 A056391 this_sequence A056393 A056394 A056395
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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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