id:A111394 - OEIS Search Results

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a(n) = product of first n integers not divisible by 3.

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1

1, 2, 8, 40, 280, 2240, 22400, 246400, 3203200, 44844800, 717516800, 12197785600, 231757926400, 4635158528000, 101973487616000, 2345390215168000, 58634755379200000, 1524503639859200000, 42686101916057600000 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = n!/(3^floor(n/3)*floor(n/3)!)`
	EXAMPLE	`a(5)=1.2.4.5.7 = 280`
	CROSSREFS	`Sequence in context: A055882 A002301 A000828 this_sequence A140363 A012597 A012534` `Adjacent sequences: A111391 A111392 A111393 this_sequence A111395 A111396 A111397`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Nov 11 2005`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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