In ternary expansion of n, reading from left to right, digits occur in order ...,0,1,2,0,1,2,...

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =6a(5) =15a(6) =19a(7) =46a(8) =59a(9) =140a(10) =177a(11) =420a(12) =532a(13) =1261a(14) =1598a(15) =3785a(16) =4794a(17) =11355a(18) =14383a(19) =34066a(20) =43151a(21) =102200a(22) =129453a(23) =306600a(24) =388360a(25) =919801a(26) =1165082a(27) =2759405a(28) =3495246a(29) =8278215