a(n) = (n-2)*(n-1)^n.

Terms

a(0) =0a(1) =0a(2) =8a(3) =162a(4) =3072a(5) =62500a(6) =1399680a(7) =34588806a(8) =939524096a(9) =27894275208a(10) =900000000000