A004529 - OEIS

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A004529

Ratios of successive terms are 1,1,1,2,3,3,3,4,5,5,5,6...

1, 1, 1, 1, 2, 6, 18, 54, 216, 1080, 5400, 27000, 162000, 1134000, 7938000, 55566000, 444528000, 4000752000, 36006768000, 324060912000, 3240609120000, 35646700320000, 392113703520000, 4313250738720000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	FORMULA	`a(n) = prod_{j=0..n-1} ( A180969(2,j+1)+A180969(2,j)+1 ) = a(n-1) * ( A180969(2,n-1)+A180969(2,n-2)+1 ). [Adriano Caroli (adriano_caroli(AT)virgilio.it), Nov 27 2010]`
	CROSSREFS	`Sequence in context: A086680 A148455 A094590 * A000778 A006725 A066158` `Adjacent sequences: A004526 A004527 A004528 * A004530 A004531 A004532`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 23:08 EST 2012. Contains 206085 sequences.