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A056492 Number of periodic palindromes using exactly six different symbols. 1
0, 0, 0, 0, 0, 0, 0, 0, 0, 360, 720, 7920, 15120, 103320, 191520, 1048320, 1905120, 9170280, 16435440, 72833040, 129230640, 541130040, 953029440, 3832187040, 6711344640, 26192766600, 45674188560 (list; graph; refs; listen; history; internal format)
OFFSET

1,10

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

FORMULA

2*A056346(n)-A056286(n).

EXAMPLE

For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.

CROSSREFS

Cf. A056457.

Sequence in context: A076205 A048978 A056502 * A158308 A205738 A112536

Adjacent sequences:  A056489 A056490 A056491 * A056493 A056494 A056495

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

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Last modified February 16 17:11 EST 2012. Contains 205938 sequences.