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A056501
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Number of primitive (period n) periodic palindromes using exactly five different symbols.
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2
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0, 0, 0, 0, 0, 0, 0, 60, 120, 960, 1800, 9300, 16800, 71400, 126000, 480000, 834120, 2968440, 5103000, 17354340, 29607600, 97566000, 165528000, 533264700, 901020120, 2854995360, 4809004080, 15050445900, 25292030400, 78417321240, 131542866000, 404936052000
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OFFSET
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1,8
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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)*A056491(n/d).
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EXAMPLE
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For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
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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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