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A056335
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Number of primitive (aperiodic) reversible string structures with n beads using a maximum of six different colors.
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2
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1, 1, 3, 9, 31, 112, 466, 2124, 10476, 55058, 301632, 1703989, 9819215, 57364723, 338134486, 2005132504, 11937364183, 71254885362, 426063226936, 2550552259119, 15280103806730, 91588103894781
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OFFSET
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1,3
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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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