A026032 - OEIS

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A026032

C(3n,n) - C(3n,n-4).

1, 3, 15, 84, 494, 2988, 18411, 114950, 724845, 4606095, 29451240, 189264672, 1221417360, 7910510312, 51388786107, 334716829674, 2185180379179, 14294808917025, 93680975707935, 614925987859260, 4042236129950970 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (2g-1)(2g^2-2g+1)/((3g-1)(g-1)^4) where g*(1-g)^2 = x. - Mark van Hoeij, Nov 09 2011`
	CROSSREFS	`a(n) = T(3n, n), where T is defined in A026022.` `Sequence in context: A195885 A115910 A106569 * A005809 A067122 A202336` `Adjacent sequences: A026029 A026030 A026031 * A026033 A026034 A026035`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`
	EXTENSIONS	`More terms from Ralf Stephan, Jan 09 2005`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.