id:A093302 - OEIS Search Results

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a(n) = (a(n-1)+(2n-1))*(2n) with a(0)=0.

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0, 2, 20, 150, 1256, 12650, 151932, 2127230, 34035920, 612646866, 12252937700, 269564629862, 6469551117240, 168208329048890, 4709833213369676, 141294996401091150, 4521439884834917792, 153728956084387206050 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`2 * [e^(1/2) * n! * 2^n] - 2n - 2.` `E.g.f.: (2x+4x^2)/(1-2x) * exp(x).`
	PROGRAM	`(PARI) a(n)=2floor(exp(1/2)n!2^n)-2n-2`
	CROSSREFS	`a(n) = A007566(n)-1 = 2*A010844(n)-2n-2. Bisection of A077138.` `Adjacent sequences: A093299 A093300 A093301 this_sequence A093303 A093304 A093305` `Sequence in context: A000183 A081159 A105489 this_sequence A093130 A043029 A115489`
	KEYWORD	`easy,nonn`
	AUTHOR	`Emrehan Halici (emrehan(AT)halici.com.tr), Apr 24 2004`
	EXTENSIONS	`Edited by Ralf Stephan, Apr 26 2004`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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