Monotonic ordering of nonnegative differences 2^i-6^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =7a(5) =10a(6) =15a(7) =26a(8) =28a(9) =31a(10) =40a(11) =58a(12) =63a(13) =92a(14) =122a(15) =127a(16) =220a(17) =250a(18) =255a(19) =296a(20) =416a(21) =476a(22) =506a(23) =511a(24) =752a(25) =808a(26) =988a(27) =1018a(28) =1023a(29) =1832