id:A121907 - OEIS Search Results

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A121907

G.f.: (1+x+x^2)/(1-2*x-2*x^2)

+0
1

1, 3, 9, 24, 66, 180, 492, 1344, 3672, 10032, 27408, 74880, 204576, 558912, 1526976, 4171776, 11397504, 31138560, 85072128, 232421376, 634987008, 1734816768, 4739607552, 12948848640, 35376912384, 96651522048, 264056868864, 721416781824, 1970947301376 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`A. Burstein and T. Mansour, Words restricted by 3-letter ..., Annals. Combin., 7 (2003), 1-14.`
	LINKS	`A. Burstein and T. Mansour, Words restricted by 3-letter ....`
	CROSSREFS	`Sequence in context: A064831 A096168 A051042 this_sequence A118771 A091587 A018047` `Adjacent sequences: A121904 A121905 A121906 this_sequence A121908 A121909 A121910`
	KEYWORD	`nonn`
	AUTHOR	`njas, Nov 20 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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