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A056466
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Number of primitive (aperiodic) palindromes using exactly five different symbols.
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4
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0, 0, 0, 0, 0, 0, 0, 0, 120, 120, 1800, 1800, 16800, 16800, 126000, 126000, 834120, 834000, 5103000, 5102880, 29607600, 29605800, 165528000, 165526200, 901020120, 901003320, 4809004080, 4808987400, 25292030400, 25291904280, 131542866000, 131542740000
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,9
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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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a(n) = Sum_{d|n} mu(d)*A056456(n/d).
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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