id:A056500 - OEIS Search Results

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Number of primitive (period n) periodic palindromes using exactly four different symbols.

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0, 0, 0, 0, 0, 12, 24, 132, 240, 900, 1560, 4968, 8400, 24, 588, 40824, 113520, 186480, 502248, 818520, 2157360, 349797, 6, 9085452, 14676024, 37723260, 60780720, 155082900, 249401640, 632, 947728, 1016542800 (list; graph; listen)

	OFFSET	`1,6`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`sum mu(d)*A056490(n/d) where d\|n.`
	EXAMPLE	`For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.`
	CROSSREFS	`Cf. A056465.` `Sequence in context: A120356 A109745 A051385 this_sequence A056490 A130163 A002167` `Adjacent sequences: A056497 A056498 A056499 this_sequence A056501 A056502 A056503`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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