a(n) = (n^3 + n^2)*6^n.

Terms

a(0) =12a(1) =432a(2) =7776a(3) =103680a(4) =1166400a(5) =11757312a(6) =109734912a(7) =967458816a(8) =8162933760a(9) =66512793600a(10) =526781325312