id:A165752 - OEIS Search Results

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a(n)=(8-5*4^n)/3.

+0
2

1, -4, -24, -104, -424, -1704, -6824, -27304, -109224, -436904, -1747624, -6990504, -27962024, -111848104, -447392424, -1789569704, -7158278824, -28633115304, -114532461224, -458129844904, -1832519379624, -7330077518504 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(0)=1, a(n)=4a(n-1)-8. a(0)=1, a(1)=-4, a(n)=5a(n-1)-4a(n-2) for n>1. G.f.: (1-9x)/(1-5x+4x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)(-5)^(n-k). a(n)=(-4)*A020989(n-1).`
	CROSSREFS	`Sequence in context: A048806 A043009 A006736 this_sequence A166036 A120908 A145655` `Adjacent sequences: A165749 A165750 A165751 this_sequence A165753 A165754 A165755`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 26 2009`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.

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