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

Terms

a(0) =0a(1) =6a(2) =288a(3) =5832a(4) =82944a(5) =972000a(6) =10077696a(7) =96018048a(8) =859963392a(9) =7346640384a(10) =60466176000a(11) =482882881536