A069045 Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i)).
1, 8, 216, 1728, 216000, 648000, 222264000, 1778112000, 16003008000, 16003008000, 21300003648000, 21300003648000, 46796108014656000, 46796108014656000, 46796108014656000, 374368864117248000
Offset: 1