Monotonic ordering of nonnegative differences 3^i-9^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =2a(2) =8a(3) =18a(4) =26a(5) =72a(6) =80a(7) =162a(8) =234a(9) =242a(10) =648a(11) =720a(12) =728a(13) =1458a(14) =2106a(15) =2178a(16) =2186a(17) =5832a(18) =6480a(19) =6552a(20) =6560a(21) =13122a(22) =18954a(23) =19602a(24) =19674a(25) =19682a(26) =52488a(27) =58320a(28) =58968a(29) =59040