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A056517 Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols. 2

%I

%S 1,1,1,3,4,10,14,36,50,138,202,561,875,2571,4105

%N Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols.

%C For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols will not change the structure.

%D 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]

%F Sum mu(d)*A056507(n/d) where d|n.

%Y Cf. A056480.

%K nonn

%O 1,4

%A _Marks R. Nester_

%E Corrected by _T. D. Noe_, Oct 25 2006

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Last modified August 17 17:25 EDT 2019. Contains 326059 sequences. (Running on oeis4.)