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 A056512 Number of periodic palindromic structures of length n 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, 101485, 179487, 752647, 1323652, 5325239, 9321312, 36387288, 63436373, 242085648, 420693273, 1577871106, 2734926558, 10120485512, 17505749898, 64096921939, 110687251039, 401885424357 (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) = A056507(n) - A056506(n). Inverse Moebius transform of A056523. - 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. CROSSREFS Column k=6 of A285012. Cf. A056475, A056506, A056507, A056523. Sequence in context: A203854 A325448 A056523 * A158998 A122559 A132131 Adjacent sequences:  A056509 A056510 A056511 * A056513 A056514 A056515 KEYWORD nonn AUTHOR EXTENSIONS a(16)-a(26) from Andrew Howroyd, Apr 07 2017 Terms a(27) and beyond from Andrew Howroyd, Oct 01 2019 STATUS approved

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Last modified January 20 08:32 EST 2022. Contains 350467 sequences. (Running on oeis4.)