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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

%I

%S 1,3,45,315,1575,51975,4729725,4729725,18555075,4583103525,

%T 50414138775,1159525191825,793359341775,15073827493725,

%U 2185704986590125,67756854584293875,1151866527932995875,3455599583798987625

%N Denominator of b(n) = sum(k=1,n,(-1)^(k+1)/k*sum(i=0,k-1,(-1)^i/(2*i+1))).

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

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

%Y Cf. A073594.

%K easy,frac,nonn

%O 1,2

%A _Benoit Cloitre_, Aug 28 2002

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Last modified July 22 16:43 EDT 2019. Contains 325225 sequences. (Running on oeis4.)