id:A082690 - OEIS Search Results

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Denominator of n*sum(k=1,(-1)^(k+1)/(n+k)).

+0
2

2, 6, 20, 210, 504, 4620, 51480, 90090, 1361360, 23279256, 21162960, 446185740, 2059318800, 5736673800, 155272637520, 9025222055850, 8494326640800, 8022419605200, 281206918792800, 267146572853160, 10431437606647200 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`limit n ->infinity n*sum(k=1, (-1)^(k+1)/(n+k)) = 1/4`
	CROSSREFS	`Cf. A082689 (numerators).` `Sequence in context: A007847 A074008 A156334 this_sequence A104861 A074859 A162682` `Adjacent sequences: A082687 A082688 A082689 this_sequence A082691 A082692 A082693`
	KEYWORD	`frac,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 12 2003`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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