id:A124131 - OEIS Search Results

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a(n)=((-1)^n/2)*sum_{i1+i2+i3=2n} ((2*n)!/(i1! i2! i3!))*B(i1+i2) where B are the Bernoulli numbers.

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0, 1, 1, 9, 77, 1037, 19113, 464785, 14410309, 554826453, 25971640865, 1452575521241, 95664836241981, 7327813077384349, 645942544224008857, 64924081840553650977, 7380723366892082000693, 942257770864409337556325 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`a(n) =(-1)^(n+1)(B(2n)(4^n-1)-1/2)`
	PROGRAM	`(PARI) a(n)=(-1)^(n+1)(bernfrac(2n)*(4^n-1)-1/2)`
	CROSSREFS	`Cf. A001469.` `Sequence in context: A075608 A126631 A046150 this_sequence A000445 A046196 A123918` `Adjacent sequences: A124128 A124129 A124130 this_sequence A124132 A124133 A124134`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 30 2006`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

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