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A056491 Number of periodic palindromes using exactly five different symbols. 1
0, 0, 0, 0, 0, 0, 0, 60, 120, 960, 1800, 9300, 16800, 71400, 126000, 480060, 834120, 2968560, 5103000, 17355300, 29607600, 97567800, 165528000, 533274060, 901020120, 2855012160, 4809004200, 15050517300 (list; graph; refs; listen; history; internal format)
OFFSET

1,8

REFERENCES

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

FORMULA

2*A056345(n)-A056285(n).

EXAMPLE

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

CROSSREFS

Cf. A056456.

Sequence in context: A177871 A049058 A056501 * A044247 A044628 A181190

Adjacent sequences:  A056488 A056489 A056490 * A056492 A056493 A056494

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 09:00 EST 2012. Contains 205904 sequences.