A128814 - OEIS

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A128814

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

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

	OFFSET	`0,2`
	COMMENTS	`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: A124212 A197949 A005439 * A108208 A203199 A135079` `Adjacent sequences: A128811 A128812 A128813 * A128815 A128816 A128817`
	KEYWORD	`easy,nonn`
	AUTHOR	`Miklos Kristof (kristmikl(AT)freemail.hu), Apr 10 2007`

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Last modified February 16 10:53 EST 2012. Contains 205904 sequences.