a(n) = 9^n * n*(n+1).

Terms

a(0) =0a(1) =18a(2) =486a(3) =8748a(4) =131220a(5) =1771470a(6) =22320522a(7) =267846264a(8) =3099363912a(9) =34867844010a(10) =383546284110