Coefficient of y^(n-2) in expansion of (y+n!)^n.

A131092

Coefficient of y^(n-2) in expansion of (y+n!)^n.

Terms

    a(0) =4a(1) =108a(2) =3456a(3) =144000a(4) =7776000a(5) =533433600a(6) =45519667200

External references