a(n) = (12*n + 6)^3.

Terms

a(0) =216a(1) =5832a(2) =27000a(3) =74088a(4) =157464a(5) =287496a(6) =474552a(7) =729000a(8) =1061208a(9) =1481544a(10) =2000376a(11) =2628072a(12) =3375000a(13) =4251528a(14) =5268024a(15) =6434856a(16) =7762392a(17) =9261000a(18) =10941048a(19) =12812904a(20) =14886936a(21) =17173512a(22) =19683000a(23) =22425768a(24) =25412184a(25) =28652616a(26) =32157432a(27) =35937000a(28) =40001688a(29) =44361864