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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
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0, 0, 0, 0, 0, 1, 1, 7, 10, 43, 65, 219, 350, 1058, 1701, 4796
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,8
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REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| 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
| 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
| Cf. A056483.
Sequence in context: A095756 A126076 A099579 * A056510 A013398 A013493
Adjacent sequences: A056518 A056519 A056520 * A056522 A056523 A056524
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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EXTENSIONS
| Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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