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A056504
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Periodic palindromic structures using a maximum of three different symbols.
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3
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1, 2, 2, 5, 5, 12, 14, 33, 41, 90, 122, 259, 365, 756, 1094, 2233
(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. A007051.
Sequence in context: A135153 A097896 A030223 * A122205 A178115 A094967
Adjacent sequences: A056501 A056502 A056503 * A056505 A056506 A056507
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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