%I #7 Mar 30 2012 18:39:17
%S 2,6,20,210,504,4620,51480,90090,1361360,23279256,21162960,446185740,
%T 2059318800,5736673800,155272637520,9025222055850,8494326640800,
%U 8022419605200,281206918792800,267146572853160,10431437606647200
%N Denominator of n*sum(k=1,(-1)^(k+1)/(n+k)).
%F limit n ->infinity n*sum(k=1, (-1)^(k+1)/(n+k)) = 1/4
%Y Cf. A082689 (numerators).
%K frac,nonn
%O 1,1
%A _Benoit Cloitre_, Apr 12 2003
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