3^a(n) is smallest power of 3 beginning with n.

Terms

a(0) =0a(1) =3a(2) =1a(3) =14a(4) =10a(5) =8a(6) =6a(7) =4a(8) =2a(9) =21a(10) =19a(11) =17a(12) =38a(13) =15a(14) =13a(15) =34a(16) =11a(17) =32a(18) =9a(19) =30a(20) =7a(21) =28a(22) =49a(23) =5a(24) =26a(25) =47a(26) =3a(27) =24a(28) =45a(29) =66