a(n) = Sum_{i=0..m} d(i)*6^i, where Sum_{i=0..m} d(i)*3^i is the base 3 representation of n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =7a(5) =8a(6) =12a(7) =13a(8) =14a(9) =36a(10) =37a(11) =38a(12) =42a(13) =43a(14) =44a(15) =48a(16) =49a(17) =50a(18) =72a(19) =73a(20) =74a(21) =78a(22) =79a(23) =80a(24) =84a(25) =85a(26) =86a(27) =216a(28) =217a(29) =218