a(n) = n^n * (n-1).A089205a(n) = n^n * (n-1).Terms a(0) =0a(1) =4a(2) =54a(3) =768a(4) =12500a(5) =233280a(6) =4941258a(7) =117440512a(8) =3099363912a(9) =90000000000External referencesoeis: A089205