id:A128814 - OEIS Search Results

Search: id:A128814

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a(0)=1, a(n)= Product(k*(k+1)/2+1, k=1..n).

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1, 2, 8, 56, 616, 9856, 216832, 6288128, 232660736, 10702393856, 599334055936, 40155381747712, 3172275158069248, 291849314542370816, 30936027341491306496, 3743259308320448086016, 512826525239901387784192 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Partial products of A000124.`
	FORMULA	`a(n) grows roughly like (n!)^2/2^n.`
	MAPLE	`a[0]:=1:for n from 1 to 20 do a[n]:=product(k*(k+1)/2+1, k=1..n) od: seq(a[n], n=0..20);`
	CROSSREFS	`Cf. A000142, A006472.` `Sequence in context: A097691 A124212 A005439 this_sequence A108208 A135079 A084872` `Adjacent sequences: A128811 A128812 A128813 this_sequence A128815 A128816 A128817`
	KEYWORD	`easy,nonn`
	AUTHOR	`Miklos Kristof (kristmikl(AT)freemail.hu), Apr 10 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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