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%I #5 Mar 30 2012 18:38:56
%S 1,8,216,1728,216000,648000,222264000,1778112000,16003008000,
%T 16003008000,21300003648000,21300003648000,46796108014656000,
%U 46796108014656000,46796108014656000,374368864117248000
%N Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i)).
%K easy,nonn
%O 1,2
%A _Benoit Cloitre_, Apr 03 2002
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