id:A072118 - OEIS Search Results

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a(n) = (2*n)!/core(n!)^2/(n+1) where core(x) is the square-free part of x.

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1, 2, 5, 224, 672, 2737152, 8895744, 474439680, 130660687872, 4513732853760000, 15798064988160000, 894413525483520000, 3194334019584000000, 27610545531676262400000, 8107146431738442547200000 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) for(n=1, 50, print1((2*n)!/core(n!)^2/(n+1), ", "))`
	CROSSREFS	`Sequence in context: A096695 A084297 A041873 this_sequence A135724 A137068 A137066` `Adjacent sequences: A072115 A072116 A072117 this_sequence A072119 A072120 A072121`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 19 2002`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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