id:A025231 - OEIS Search Results

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a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 3.

+0
2

2, 3, 12, 57, 300, 1686, 9912, 60213, 374988, 2381322, 15361896, 100389306, 663180024, 4421490924, 29712558576, 201046204173, 1368578002188, 9366084668802, 64403308499592, 444739795023054, 3082969991029800 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`G.f.: (1-sqrt(1-8x+4x^2))/2 - Michael Somos, Jun 08, 2000.`
	PROGRAM	`(PARI) a(n)=polcoeff((1-sqrt(1-8x+4x^2+x*O(x^n)))/2, n)`
	CROSSREFS	`Essentially the same as A047891.` `Sequence in context: A002638 A027072 A083746 this_sequence A094532 A092980 A052183` `Adjacent sequences: A025228 A025229 A025230 this_sequence A025232 A025233 A025234`
	KEYWORD	`nonn,eigen`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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