id:A091103 - OEIS Search Results

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Expansion of (1-3x+12x^2)/((1-3x)(1+3x)).

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1, -3, 21, -27, 189, -243, 1701, -2187, 15309, -19683, 137781, -177147, 1240029, -1594323, 11160261, -14348907, 100442349, -129140163, 903981141, -1162261467, 8135830269, -10460353203, 73222472421, -94143178827, 659002251789, -847288609443 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(0)=1, a(2n-1)=-k^(2n-1), a(2n)=(3k-2)k^(2n-1), k=3; G.f.: (1-kx+2(k-1)kx^2)/((1-kx)(1+kx)), k=3.`
	FORMULA	`a(n)=23^n/3+5(-3)^n/3-40^n/3`
	CROSSREFS	`Sequence in context: A050586 A074217 A062219 this_sequence A045802 A006133 A039766` `Adjacent sequences: A091100 A091101 A091102 this_sequence A091104 A091105 A091106`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 22 2003`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

AT&T Labs Research