a(n) = 3*n*(3*n-1)*(3*n-2).

Terms

a(0) =0a(1) =6a(2) =120a(3) =504a(4) =1320a(5) =2730a(6) =4896a(7) =7980a(8) =12144a(9) =17550a(10) =24360a(11) =32736a(12) =42840a(13) =54834a(14) =68880a(15) =85140a(16) =103776a(17) =124950a(18) =148824a(19) =175560a(20) =205320a(21) =238266a(22) =274560a(23) =314364a(24) =357840a(25) =405150a(26) =456456a(27) =511920a(28) =571704a(29) =635970