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A056522
Number of primitive (period n) periodic palindromic structures using exactly five different symbols.
3
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, 210766920, 653516168, 1096190550, 3374551384, 5652751636, 17305626334, 28958095545, 88274117232
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
FORMULA
a(n) = A056516(n) - A056515(n).
Moebius transform of A056511. - 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 A056511.
CROSSREFS
Column 5 of A285037.
Sequence in context: A278921 A035407 A020139 * A056511 A339314 A166626
KEYWORD
nonn
EXTENSIONS
a(17)-a(28) from Andrew Howroyd, Apr 09 2017
Terms a(29) and beyond from Andrew Howroyd, Oct 01 2019
STATUS
approved