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A056338
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Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors.
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1
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0, 0, 0, 1, 6, 37, 183, 876, 3930, 17179, 73095, 306323, 1267266, 5198374, 21182337, 85910040, 347187210, 1399447578, 5629911015, 22616239535, 90754854843, 363890053582, 1458172596903, 5840531328120, 23385650196084
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OFFSET
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1,5
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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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