a(n) = (Greatest base 3 digit of n) - (least base 3 digit of n).

Terms

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