id:A091104 - OEIS Search Results

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Expansion of (1-4x+24x^2)/((1-4x)(1+4x).

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1, -4, 40, -64, 640, -1024, 10240, -16384, 163840, -262144, 2621440, -4194304, 41943040, -67108864, 671088640, -1073741824, 10737418240, -17179869184, 171798691840, -274877906944, 2748779069440, -4398046511104, 43980465111040, -70368744177664 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(0)=1, a(2n-1)=-k^(2n-1), a(2n)=(3k-2)k^(2n-1), k=4; G.f.: (1-kx+2(k-1)kx^2)/((1-kx)(1+kx)), k=4.`
	FORMULA	`a(n)=34^n/4+7(-4)^n/4-60^n/4`
	CROSSREFS	`Sequence in context: A131535 A077329 A061473 this_sequence A069539 A063997 A009355` `Adjacent sequences: A091101 A091102 A091103 this_sequence A091105 A091106 A091107`
	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