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A056321
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Number of primitive (aperiodic) reversible strings with n beads using exactly five different colors.
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1
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0, 0, 0, 0, 60, 900, 8400, 63000, 417120, 2551500, 14804700, 82764000, 450518460, 2404502100, 12646078140, 65771433000, 339165516120, 1737485731740, 8855359634100, 44952365429940, 227475768899460
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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.
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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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