id:A165553 - OEIS Search Results

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a(n)= (3/2)*(1+(-3)^(n-1)).

+0
3

1, 3, -3, 15, -39, 123, -363, 1095, -3279, 9843, -29523, 88575, -265719, 797163, -2391483, 7174455, -21523359, 64570083, -193710243, 581130735, -1743392199, 5230176603, -15690529803, 47071589415, -141214768239 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(n)/a(n-1) tends to -3.`
	FORMULA	`a(0)=1, a(1)=3, a(n)=3a(n-2)-2a(n-1). G.f.: (1+5x)/(1+2x-3x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)*2^(n-k).`
	CROSSREFS	`Cf. A046717, A084247` `Sequence in context: A089875 A035617 A126319 this_sequence A056314 A078631 A046983` `Adjacent sequences: A165550 A165551 A165552 this_sequence A165554 A165555 A165556`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 21 2009`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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