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A073594 Numerator of b(n) = sum(k=1,n,(-1)^(k+1)/k*sum(i=0,k-1,(-1)^i/(2*i+1))). 1
1, 2, 43, 244, 1483, 42494, 4421639, 3975704, 17273323, 3917984134, 46801334969, 1002549557332, 735057842971, 13139661722338, 2022120072706607, 59425819929320912, 1064450614009503859, 3045237174301650742 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

FORMULA

lim n -> infinity b(n) = G the Catalan constant

PROG

(PARI) a(n)=numerator( sum(k=1, n, (-1)^(k+1)/k*sum(i=0, k-1, (-1)^i/(2*i+1))))

CROSSREFS

Cf. A073595.

Sequence in context: A079823 A107156 A062582 * A112097 A220270 A240550

Adjacent sequences:  A073591 A073592 A073593 * A073595 A073596 A073597

KEYWORD

easy,frac,nonn

AUTHOR

Benoit Cloitre, Aug 28 2002

STATUS

approved

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Last modified July 23 11:44 EDT 2019. Contains 325254 sequences. (Running on oeis4.)