id:A087944 - OEIS Search Results

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Expansion of (1-4x+3x^2)/((1-2x)(1-4x+x^2)).

+0
4

1, 2, 6, 20, 70, 252, 922, 3404, 12630, 46988, 175066, 652764, 2434966, 9085052, 33901146, 126511340, 472127830, 1761967212, 6575675482, 24540603644, 91586476950, 341804779868, 1275631593946, 4760719498764, 17767242206806 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Binomial transform of A052948.`
	FORMULA	`a(0)=1, a(2)=2, a(2)=6, a(n)=6a(n-1)-9a(n-2)+2a(n-3), n>2; a(n)=(2^n+(2+sqrt(3))^n+(2-sqrt(3))^n)/3`
	CROSSREFS	`Adjacent sequences: A087941 A087942 A087943 this_sequence A087945 A087946 A087947` `Sequence in context: A135413 A065345 A130914 this_sequence A056616 A065346 A071976`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 16 2003`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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