A101601 - OEIS

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A101601

G.f.: c(3x)^3, c(x) the g.f. of A000108.

1, 9, 81, 756, 7290, 72171, 729729, 7505784, 78298974, 826489170, 8811646074, 94753804536, 1026499549140, 11192793160815, 122744496427425, 1352917116177840, 14979996753469110, 166542316847391870 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: 8/(1+sqrt(1-12x))^3; a(n)=((3n+3)/(n+3))3^nC(n+1).` `Conjecture: (n+3)a(n) -3(5n+7)a(n-1) +18(2n-1)a(n-2)=0. - R. J. Mathar, Nov 15 2011`
	CROSSREFS	`Cf. A050159, A101600, A101602.` `Sequence in context: A061587 A033145 A158762 * A144821 A199689 A181581` `Adjacent sequences: A101598 A101599 A101600 * A101602 A101603 A101604`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 08 2004`

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Last modified February 13 18:46 EST 2012. Contains 205535 sequences.