a(n) = (3*10^n + 2*0^n)/5.

Terms

a(0) =1a(1) =6a(2) =60a(3) =600a(4) =6000a(5) =60000a(6) =600000a(7) =6000000a(8) =60000000a(9) =600000000a(10) =6000000000a(11) =60000000000a(12) =600000000000