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A056513
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Number of primitive (period n) periodic palindromic structures using a maximum of two different symbols.
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3
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1, 1, 1, 2, 3, 4, 7, 10, 14, 21, 31, 42, 63, 91, 123, 184
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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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
| Sum mu(d)*A056503(n/d) where d divides n.
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CROSSREFS
| Cf. A056476.
Sequence in context: A184639 A035565 * A056518 A160644 A145467 A039841
Adjacent sequences: A056510 A056511 A056512 * A056514 A056515 A056516
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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