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A056508
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Periodic palindromic structures using exactly two different symbols.
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0
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0, 1, 1, 3, 3, 6, 7, 13, 15, 25, 31, 50, 63, 99, 127, 197
(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
| A056503(n)-1.
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CROSSREFS
| Cf. A052551.
Sequence in context: A034401 A088571 A027187 * A050065 A078477 A098832
Adjacent sequences: A056505 A056506 A056507 * A056509 A056510 A056511
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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