id:A165750 - OEIS Search Results

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

+0
2

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

	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: A037692 A126531 A165511 this_sequence A138425 A010569 A136870` `Adjacent sequences: A165747 A165748 A165749 this_sequence A165751 A165752 A165753`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 26 2009`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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