id:A091105 - OEIS Search Results

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Expansion of (1-5x+40x^2)/((1-5x)(1+5x)).

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1, -5, 65, -125, 1625, -3125, 40625, -78125, 1015625, -1953125, 25390625, -48828125, 634765625, -1220703125, 15869140625, -30517578125, 396728515625, -762939453125, 9918212890625, -19073486328125, 247955322265625, -476837158203125, 6198883056640625 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(0)=1, a(2n-1)=-k^(2n-1), a(2n)=(3k-2)k^(2n-1), k=5; G.f.: (1-kx+2(k-1)kx^2)/((1-kx)(1+kx)), k=5.`
	FORMULA	`a(n)=45^n/5+9(-5)^n/5-80^n/5`
	CROSSREFS	`Sequence in context: A061684 A061698 A126955 this_sequence A071902 A052199 A093195` `Adjacent sequences: A091102 A091103 A091104 this_sequence A091106 A091107 A091108`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 22 2003`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

AT&T Labs Research