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Search: id:A056515
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| A056515 |
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Number of primitive (period n) periodic palindromic structures using a maximum of four different symbols. |
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+0
3
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| 1, 1, 1, 3, 4, 10, 14, 35, 49, 127, 186, 463, 714, 1799, 2789, 6996
(list; graph; listen)
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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)*A056505(n/d) where d|n.
Moebius transform of A056505.
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CROSSREFS
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Cf. A056478.
Sequence in context: A106523 A121720 A007068 this_sequence A056516 A056517 A048155
Adjacent sequences: A056512 A056513 A056514 this_sequence A056516 A056517 A056518
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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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