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A056502 Number of primitive (period n) periodic palindromes using exactly six different symbols. 2
0, 0, 0, 0, 0, 0, 0, 0, 0, 360, 720, 7920, 15120, 103320, 191520, 1048320, 1905120, 9170280, 16435440, 72832680, 129230640, 541129320, 953029440, 3832179120, 6711344640, 26192751480, 45674188560, 174286569240, 302899156560, 1136022947280, 1969147121760 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

FORMULA

a(n) = Sum_{d|n} mu(d)*A056492(n/d).

EXAMPLE

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

CROSSREFS

Column 6 of A327878.

Cf. A056467, A056492.

Sequence in context: A063067 A076205 A048978 * A056492 A158308 A205738

Adjacent sequences:  A056499 A056500 A056501 * A056503 A056504 A056505

KEYWORD

nonn

AUTHOR

Marks R. Nester

EXTENSIONS

Terms a(28) and beyond from Andrew Howroyd, Sep 28 2019

STATUS

approved

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Last modified April 4 23:59 EDT 2020. Contains 333238 sequences. (Running on oeis4.)