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Search: id:A056488
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| A056488 |
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Number of periodic palindromes using a maximum of six different symbols. |
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2
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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; listen)
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OFFSET
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1,1
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REFERENCES
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M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
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a(n)=6^((n+1)/2) for n odd, a(n)=6^(n/2)*7/2 for n even.
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EXAMPLE
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For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
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CROSSREFS
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Cf. A029744, A038754, A056452.
Adjacent sequences: A056485 A056486 A056487 this_sequence A056489 A056490 A056491
Sequence in context: A139606 A047717 A089982 this_sequence A031042 A064431 A031094
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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