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Search: id:A056521
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| A056521 |
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Number of primitive (period n) periodic palindromic structures using exactly four different symbols. |
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+0
1
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| 0, 0, 0, 0, 0, 1, 1, 7, 10, 43, 65, 219, 350, 1058, 1701, 4796
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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.
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FORMULA
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A056515(n)-A056514(n).
This is the Moebius transform of A056510. - T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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EXAMPLE
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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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CROSSREFS
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Cf. A056483.
Sequence in context: A095756 A126076 A099579 this_sequence A056510 A013398 A013493
Adjacent sequences: A056518 A056519 A056520 this_sequence A056522 A056523 A056524
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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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