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Search: id:A056517
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| A056517 |
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Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols. |
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+0
2
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| 1, 1, 1, 3, 4, 10, 14, 36, 50, 138, 202, 561, 875, 2571, 4105
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OFFSET
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1,4
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COMMENT
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For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols 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.
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FORMULA
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Sum mu(d)*A056507(n/d) where d|n.
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CROSSREFS
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Cf. A056480.
Sequence in context: A007068 A056515 A056516 this_sequence A048155 A103080 A055720
Adjacent sequences: A056514 A056515 A056516 this_sequence A056518 A056519 A056520
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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