A010786 - OEIS

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A010786

Floor-factorial numbers: Product [ n/k ]; k=1..n.

1, 2, 3, 8, 10, 36, 42, 128, 216, 600, 660, 3456, 3744, 9408, 18900, 61440, 65280, 279936, 295488, 1152000, 2116800, 4878720, 5100480, 31850496, 41472000, 93450240, 163762560, 568995840, 589317120, 3265920000, 3374784000 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to factorial numbers`
	FORMULA	`Product floor(n/1)floor(n/2)floor(n/3)...floor(n/n).` `a(n)=product{1<=k<=n} floor(n/k).`
	MAPLE	`f := n->product( floor(n/k), k=1..n);`
	CROSSREFS	`Cf. A131385, A131387.` `Sequence in context: A107401 A165153 A121989 * A005727 A118089 A201541` `Adjacent sequences: A010783 A010784 A010785 * A010787 A010788 A010789`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)`
	EXTENSIONS	`More terms from Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Jul 08 2007` `Edited by N. J. A. Sloane (njas(AT)research.att.com), Jul 05 2008 at the suggestion of Rick L. Shepherd`

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.