id:A131385 - OEIS Search Results

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Product ceiling(n/1)*ceiling(n/2)*ceiling(n/3)*...*ceiling(n/n) (the 'ceiling factorial').

+0
6

1, 2, 6, 16, 60, 144, 672, 1536, 6480, 19200, 76032, 165888, 1048320, 2257920, 8294400, 28311552, 126904320, 268738560, 1470873600, 3096576000, 16094453760, 51385466880, 175814737920, 366917713920, 2717245440000 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=product{1<=k<=n} ceiling(n/k).`
	CROSSREFS	`Cf. A010786, A131387.` `Sequence in context: A068787 A073959 A006820 this_sequence A027742 A033301 A093113` `Adjacent sequences: A131382 A131383 A131384 this_sequence A131386 A131387 A131388`
	KEYWORD	`nonn`
	AUTHOR	`Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Jul 08 2007`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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