a(n) = (4*n+8)(!^4)/8(!^4), related to A034177(n+1) ((4*n+4)(!^4) quartic, or 4-factorials).

A051620

a(n) = (4*n+8)(!^4)/8(!^4), related to A034177(n+1) ((4*n+4)(!^4) quartic, or 4-factorials).

Terms

    a(0) =1a(1) =12a(2) =192a(3) =3840a(4) =92160a(5) =2580480a(6) =82575360a(7) =2972712960a(8) =118908518400

External references