id:A072116 - OEIS Search Results

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(2n)!/(phi(2n)!)^2.

+0
1

2, 6, 180, 70, 6300, 831600, 168168, 12870, 12350257920, 1496523600, 85357272, 381649434566400, 1757701400, 1328822258400, 163162002966958195200000, 601080390, 674412197580, 1621291929818474833920000, 12759640231800 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) for(n=1, 30, print1((2n)!/(eulerphi(2n))!^2, ", "))`
	CROSSREFS	`Sequence in context: A003189 A135937 A137532 this_sequence A055696 A091439 A013083` `Adjacent sequences: A072113 A072114 A072115 this_sequence A072117 A072118 A072119`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 19 2002`

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

AT&T Labs Research