Cubes of Motzkin numbers.

Terms

a(0) =1a(1) =1a(2) =8a(3) =64a(4) =729a(5) =9261a(6) =132651a(7) =2048383a(8) =33698267a(9) =582182875a(10) =10474708672a(11) =194910229592