id:A091096 - OEIS Search Results

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

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1, 5, -15, 125, -375, 3125, -9375, 78125, -234375, 1953125, -5859375, 48828125, -146484375, 1220703125, -3662109375, 30517578125, -91552734375, 762939453125, -2288818359375, 19073486328125, -57220458984375, 476837158203125, -1430511474609375 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(0)=1, a(2n-1)=k^(2n-1), a(2n)=(2-k)k^(2n-1), k=5; G.f.: (1+kx+(2-2k)kx^2)/((1-kx)(1+kx)), k=5.`
	FORMULA	`a(n)=5^n/5 +(-4)(-5)^n/5+8*0^n/5`
	CROSSREFS	`Adjacent sequences: A091093 A091094 A091095 this_sequence A091097 A091098 A091099` `Sequence in context: A088418 A080490 A050542 this_sequence A116957 A124209 A048347`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 19 2003`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

AT&T Labs Research