Monotonic ordering of nonnegative differences 2^i-9^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =15a(5) =23a(6) =31a(7) =47a(8) =55a(9) =63a(10) =119a(11) =127a(12) =175a(13) =247a(14) =255a(15) =295a(16) =431a(17) =503a(18) =511a(19) =943a(20) =1015a(21) =1023a(22) =1319a(23) =1631a(24) =1967a(25) =2039a(26) =2047a(27) =3367a(28) =4015a(29) =4087