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A056488
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Number of periodic palindromes using a maximum of six different symbols.
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1
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6, 21, 36, 126, 216, 756, 1296, 4536, 7776, 27216, 46656, 163296, 279936, 979776, 1679616, 5878656, 10077696, 35271936, 60466176, 211631616, 362797056, 1269789696, 2176782336, 7618738176, 13060694016
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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
| a(n)=6^((n+1)/2) for n odd, a(n)=6^(n/2)*7/2 for n even.
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EXAMPLE
| For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
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CROSSREFS
| Cf. A029744, A038754, A056452.
Sequence in context: A047717 A089982 A151943 * A031042 A064431 A031094
Adjacent sequences: A056485 A056486 A056487 * A056489 A056490 A056491
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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