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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
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OFFSET
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1,2
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COMMENTS
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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. [See A056391 for pdf file of Chap. 2]
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LINKS
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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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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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