id:A056489 - OEIS Search Results

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Number of periodic palindromes using exactly three different symbols.

+0
2

0, 0, 0, 3, 6, 21, 36, 93, 150, 345, 540, 1173, 1806, 3801, 5796, 11973, 18150, 37065, 55980, 113493, 171006, 345081, 519156, 1044453, 1569750, 3151785, 4733820, 9492213, 14250606, 28550361, 42850116 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`2*A056343(n)-A056283(n).`
	CROSSREFS	`Cf. A056454.` `Sequence in context: A069558 A050611 A056499 this_sequence A015649 A076102 A094282` `Adjacent sequences: A056486 A056487 A056488 this_sequence A056490 A056491 A056492`
	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.

AT&T Labs Research