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A056337
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Number of primitive (aperiodic) reversible string structures with n beads using exactly three different colors.
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1
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0, 0, 1, 4, 15, 49, 160, 498, 1544, 4715, 14356, 43420, 131145, 394990, 1188564, 3572400, 10732065, 32224216, 96733636, 290317660, 871200664, 2614083394, 7843255300, 23531731530, 70599259170, 211805771345
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OFFSET
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1,4
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COMMENTS
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A string and its reverse are considered to be equivalent. Permuting the colors 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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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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