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A056523
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Number of primitive (period n) periodic palindromic structures using exactly six different symbols.
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0
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 13, 21, 154, 266
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,12
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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
| A056517(n)-A056516(n).
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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. This should be different from A056512.
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CROSSREFS
| Cf. A056485.
Sequence in context: A147435 A203854 A056512 * A158998 A122559 A132131
Adjacent sequences: A056520 A056521 A056522 * A056524 A056525 A056526
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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