A027558 - OEIS

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A027558

Number of 3-unbalanced strings of length n (=2^n-A027557[ n ]).

0, 0, 0, 0, 2, 6, 20, 50, 126, 288, 654, 1422, 3068, 6474, 13574, 28112, 57942, 118566, 241788, 490914, 994334, 2008512, 4050398, 8154014, 16396668, 32935194, 66104982, 132586416, 265792070, 532579830, 1066790972 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	FORMULA	`2A005674.` `G.f.:-2x^4/((2x-1)(2x^2-1)(x^2+x-1)) [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 12 2009]`
	CROSSREFS	`Sequence in context: A121128 A056820 A204422 * A066397 A060344 A045655` `Adjacent sequences: A027555 A027556 A027557 * A027559 A027560 A027561`
	KEYWORD	`nonn`
	AUTHOR	`R. K. Guy (rkg(AT)cpsc.ucalgary.ca), callan(AT)bayes.stat.wisc.edu (David Callan)`

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Last modified February 14 09:35 EST 2012. Contains 205614 sequences.