id:A091095 - OEIS Search Results

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

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1, 4, -8, 64, -128, 1024, -2048, 16384, -32768, 262144, -524288, 4194304, -8388608, 67108864, -134217728, 1073741824, -2147483648, 17179869184, -34359738368, 274877906944, -549755813888, 4398046511104, -8796093022208, 70368744177664 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(0)=1, a(2n-1)=k^(2n-1), a(2n)=(2-k)k^(2n-1), k=4; G.f.: (1+kx+(2-2k)kx^2)/((1-kx)(1+kx)), k=4.`
	FORMULA	`a(n)=4^n/4+(-3)(-4)^n/4+6*0^n/4`
	CROSSREFS	`Sequence in context: A123288 A063083 A120777 this_sequence A075787 A086891 A117636` `Adjacent sequences: A091092 A091093 A091094 this_sequence A091096 A091097 A091098`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 19 2003`

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

AT&T Labs Research