Monotonic ordering of nonnegative differences 4^i-3^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =13a(5) =15a(6) =37a(7) =55a(8) =61a(9) =63a(10) =175a(11) =229a(12) =247a(13) =253a(14) =255a(15) =295a(16) =781a(17) =943a(18) =997a(19) =1015a(20) =1021a(21) =1023a(22) =1909a(23) =3367a(24) =3853a(25) =4015a(26) =4069a(27) =4087a(28) =4093a(29) =4095