A026033 - OEIS

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A026033

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

1, 4, 28, 220, 1819, 15484, 134320, 1180764, 10482340, 93766288, 843822148, 7631018564, 69291185474, 631334484200, 5769124912320, 52851389067420, 485242722376524, 4463782855666480, 41133265444555120 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (g-2)(2-2g+g^2)g^2/(3g-4) where g = 1+x*g^4 is the g.f. of A002293. - Mark van Hoeij, Nov 11 2011`
	CROSSREFS	`a(n) = T(4n, n), where T is defined in A026022.` `Sequence in context: A039741 A130185 A026020 * A005810 A121203 A192620` `Adjacent sequences: A026030 A026031 A026032 * A026034 A026035 A026036`
	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 08:21 EST 2012. Contains 205998 sequences.