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A056507
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Number of periodic palindromic structures using a maximum of six different symbols.
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2
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1, 2, 2, 5, 5, 13, 15, 41, 52, 144, 203, 577, 876, 2587, 4111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| 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
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| No formula known - terms found by computer search.
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CROSSREFS
| Cf. A056471.
Sequence in context: A094967 A056505 A056506 * A095014 A129996 A099363
Adjacent sequences: A056504 A056505 A056506 * A056508 A056509 A056510
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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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