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A056523 Number of primitive (period n) periodic palindromic structures using exactly six different symbols. 3
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 13, 21, 154, 266, 1488, 2646, 12857, 22827, 101484, 179487, 752646, 1323652, 5325226, 9321312, 36387267, 63436373, 242085494, 420693273, 1577870839, 2734926558, 10120484024, 17505749897, 64096919293, 110687251039, 401885411487 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,12

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) = A056517(n) - A056516(n).

Moebius transform of A056512. - Andrew Howroyd, Oct 01 2019

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 A056512.

CROSSREFS

Column 6 of A285037.

Cf. A056485, A056512, A056516, A056517.

Sequence in context: A269309 A203854 A325448 * A056512 A158998 A122559

Adjacent sequences:  A056520 A056521 A056522 * A056524 A056525 A056526

KEYWORD

nonn

AUTHOR

Marks R. Nester

EXTENSIONS

a(16)-a(26) from Andrew Howroyd, Apr 09 2017

Terms a(27) and beyond from Andrew Howroyd, Oct 01 2019

STATUS

approved

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Last modified February 18 02:57 EST 2020. Contains 332006 sequences. (Running on oeis4.)