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A056522 Number of primitive (period n) periodic palindromic structures using exactly five different symbols. 1
0, 0, 0, 0, 0, 0, 0, 1, 1, 10, 15, 85, 140, 618, 1050, 4064, 6951, 24914, 42525, 145057, 246730, 814200, 1379400, 4446545, 7508501, 23798460, 40075034, 125435695 (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

Table of n, a(n) for n=1..28.

FORMULA

A056516(n)-A056515(n).

EXAMPLE

For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols will not change the structure. This should be different from A056511.

CROSSREFS

Column 5 of A285037.

Cf. A056484.

Sequence in context: A278921 A035407 A020139 * A056511 A166626 A238759

Adjacent sequences:  A056519 A056520 A056521 * A056523 A056524 A056525

KEYWORD

nonn

AUTHOR

Marks R. Nester

EXTENSIONS

a(17)-a(28) from Andrew Howroyd, Apr 09 2017

STATUS

approved

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Last modified July 24 04:08 EDT 2019. Contains 325290 sequences. (Running on oeis4.)