A165750 - OEIS

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A165750

a(n)= (10/11)*(2+9*(-10)^(n-1)).

1, 10, -80, 820, -8180, 81820, -818180, 8181820, -81818180, 818181820, -8181818180, 81818181820, -818181818180, 8181818181820, -81818181818180, 818181818181820, -8181818181818180, 8181818181818180 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(0)=1, a(1)=10, a(n)= 10a(n-2)-9a(n-1). a(0)=1, a(n)=(-10)a(n-1)+20 for n>=1. G.f.: (1+19x)/(1+9x-10x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)9^(n-k).`
	CROSSREFS	`Sequence in context: A126531 A200162 A165511 * A138425 A010569 A136870` `Adjacent sequences: A165747 A165748 A165749 * A165751 A165752 A165753`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 26 2009`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.