id:A133681 - OEIS Search Results

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a(n)=9*a(n-1)+90*a(n-2) for n>=3, a(0)=1, a(1)=9, a(2)=162 .

+0
2

1, 9, 162, 2268, 34992, 519048, 7820712, 117100728, 1757770632, 26359001208, 395430367752, 5931183418488, 88969383864072, 1334530962440568, 20018023209731592, 300269995507235448, 4504052048440962312 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1-9x^2)/(1-9x-90x^2) . a(n) = Sum_{k, 0<=k<=n}A122950(n,k)9^k .`
	CROSSREFS	`Sequence in context: A023039 A133793 A084874 this_sequence A051232 A077280 A041147` `Adjacent sequences: A133678 A133679 A133680 this_sequence A133682 A133683 A133684`
	KEYWORD	`easy,nonn`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 31 2007`

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Last modified August 28 22:44 EDT 2008. Contains 143251 sequences.

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