%I #13 Jun 26 2019 11:03:30
%S 2,8,3,192,960,1920,1680,215040,645120,64512,1419264,11354112,
%T 147603456,295206912,46126080,47233105920,802962800640,802962800640,
%U 15256293212160,61025172848640,61025172848640,122050345697280
%N Denominators of Sum_{k=1..n} 1/(k * 2^k).
%C Sum_{k>=1} 1/(k * 2^k) = log(2).
%o (PARI) a(n) = denominator(sum(k=1, n, 1/(k * 2^k))); \\ _Michel Marcus_, Jun 26 2019
%Y Cf. A068566.
%K easy,frac,nonn
%O 1,1
%A _Benoit Cloitre_, Mar 25 2002
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