id:A049606 - OEIS Search Results

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Denominator of 2^n/n!.

+0
13

1, 1, 1, 3, 3, 15, 45, 315, 315, 2835, 14175, 155925, 467775, 6081075, 42567525, 638512875, 638512875, 10854718875, 97692469875, 1856156927625, 9280784638125, 194896477400625, 2143861251406875, 49308808782358125, 147926426347074375 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`a(n) = A000265(A000142(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Apr 09 2004` `Largest odd divisor of n!. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 10 2005`
	LINKS	`T. D. Noe, Table of n, a(n) for n=0..100`
	FORMULA	`Product_{k=1..n} A000265(k).`
	CROSSREFS	`Numerators give A001316. Cf. A000680.` `Cf. A008977, A139541.` `Sequence in context: A078631 A046983 A067655 this_sequence A046126 A089403 A111674` `Adjacent sequences: A049603 A049604 A049605 this_sequence A049607 A049608 A049609`
	KEYWORD	`nonn,frac,easy`
	AUTHOR	`njas, Feb 05 2000`

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.

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