%I #7 May 01 2024 13:06:11
%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)).
%Y Cf. A007480, A002805.
%K easy,nonn
%O 1,2
%A _Benoit Cloitre_, Apr 03 2002