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A073595 Denominator of b(n) = sum(k=1,n,(-1)^(k+1)/k*sum(i=0,k-1,(-1)^i/(2*i+1))). 1
1, 3, 45, 315, 1575, 51975, 4729725, 4729725, 18555075, 4583103525, 50414138775, 1159525191825, 793359341775, 15073827493725, 2185704986590125, 67756854584293875, 1151866527932995875, 3455599583798987625 (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)=denominator(sum(k=1, n, (-1)^(k+1)/k*sum(i=0, k-1, (-1)^i/(2*i+1))))

CROSSREFS

Cf. A073594.

Sequence in context: A289193 A062346 A002682 * A117972 A061532 A060242

Adjacent sequences:  A073592 A073593 A073594 * A073596 A073597 A073598

KEYWORD

easy,frac,nonn

AUTHOR

Benoit Cloitre, Aug 28 2002

STATUS

approved

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Last modified June 18 07:15 EDT 2019. Contains 324203 sequences. (Running on oeis4.)