A113296 - OEIS

This site is supported by donations to The OEIS Foundation.

A113296

Cumulative product of double factorial A006882.

1, 1, 2, 6, 48, 720, 34560, 3628800, 1393459200, 1316818944000, 5056584744960000, 52563198423859200000, 2422112183371431936000000, 327312129899898454671360000000, 211155601241022491077587763200000000 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..14.` `Eric Weisstein's World of Mathematics, Double Factorial.`
	FORMULA	`a(n) = Prod[i=0 to n] n!!. a(n) = n!! * a(n-1) where a(0) = 0, a(1) = 1 and n >= 2. a(n) = n(n-2)!! a(n-1) where a(0) = 0, a(1) = 1 and n >= 2.`
	EXAMPLE	`a(10) = 1!! * 2!! * 3!! * 4!! * 5!! * 6!! * 7!! * 8!! * 9!! * 10!!` `= 1 * 2 * 3 * 8 * 15 * 48 * 105 * 384 * 945 * 3840` `= 5056584744960000 = 2^23 x 3^9 x 5^4 x 7^2.`
	CROSSREFS	`Cf. A006882.` `Sequence in context: A175430 A129464 A003053 * A063744 A141609 A096313` `Adjacent sequences: A113293 A113294 A113295 * A113297 A113298 A113299`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post, Feb 18 2006`
	STATUS	`approved`

Content is available under The OEIS End-User License Agreement .

Last modified May 22 01:57 EDT 2013. Contains 225510 sequences.