Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i^2)).

A069046

Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i^2)).

Terms

    a(0) =1a(1) =4a(2) =36a(3) =144a(4) =3600a(5) =3600a(6) =176400a(7) =705600a(8) =6350400a(9) =31752000a(10) =3841992000a(11) =3841992000a(12) =649296648000a(13) =649296648000a(14) =129859329600a(15) =519437318400

External references