id:A089639 - OEIS Search Results

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Denominator of (5/2)*sum(k=1,n,(-1)^(k+1)/k^3/C(2k,k)).

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4, 96, 864, 48384, 1209600, 5702400, 25427001600, 203416012800, 31122649958400, 53757304473600, 71550972254361600, 7446481275340800, 278118629152703539200, 278118629152703539200, 40327201227142013184000 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`zeta(3)=5/2*sum(k=1, infty, (-1)^(k+1)/k^3/C(2k, k))`
	PROGRAM	`(PARI) a(n)=denominator(5/2sum(k=1, n, (-1)^(k+1)/k^3/binomial(2k, k)))`
	CROSSREFS	`Cf. A002117.` `Sequence in context: A116291 A061992 A068114 this_sequence A112092 A062779 A077155` `Adjacent sequences: A089636 A089637 A089638 this_sequence A089640 A089641 A089642`
	KEYWORD	`frac,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 01 2004`

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

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