%I #5 Mar 30 2012 18:38:56
%S 1,4,36,144,3600,10800,529200,2116800,6350400,6350400,768398400,
%T 768398400,129859329600,129859329600,129859329600,519437318400,
%U 150117385017600,450352155052800,162577127974060800,6503085118962432
%N Denominator(sum(i=1,n,1/i^5))/denominator(sum(i=1,n,1/i^3)).
%K easy,nonn
%O 1,2
%A _Benoit Cloitre_, Apr 03 2002