This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A192168 #6 Oct 21 2019 15:00:31
%S A192168 0,4,7,48,60,63,256,448,496,508,511,3072,3840,4032,4080,4092,4095,
%T A192168 16384,28672,31744,32512,32704,32752,32764,32767,196608,245760,258048,
%U A192168 261120,261888,262080,262128,262140,262143,1048576,1835008,2031616,2080768,2093056
%N A192168 Monotonic ordering of nonnegative differences 8^i-4^j, for 40>= i>=0, j>=0.
%t A192168 c = 8; d = 4; t[i_, j_] := c^i - d^j;
%t A192168 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192168 v = Union[Flatten[u ]]
%Y A192168 Cf. A192167.
%K A192168 nonn
%O A192168 1,2
%A A192168 _Clark Kimberling_, Jun 24 2011