Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i)).

A069045

Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i)).

Terms

    a(0) =1a(1) =8a(2) =216a(3) =1728a(4) =216000a(5) =648000a(6) =222264000a(7) =1778112000a(8) =16003008000a(9) =16003008000

External references