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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 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 January 26 22:05 EST 2022. Contains 350601 sequences. (Running on oeis4.)