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 A192113 #6 Oct 21 2019 14:27:39
%S A192113 0,2,3,8,12,14,15,32,48,56,60,62,63,128,192,224,240,248,252,254,255,
%T A192113 512,768,896,960,992,1008,1016,1020,1022,1023,2048,3072,3584,3840,
%U A192113 3968,4032,4064,4080,4088,4092,4094,4095,8192,12288,14336,15360,15872,16128
%N A192113 Monotonic ordering of nonnegative differences 4^i-2^j, for 40>=i>=0, j>=0.
%t A192113 c = 4; d = 2; t[i_, j_] := c^i - d^j;
%t A192113 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192113 v = Union[Flatten[u ]]
%Y A192113 Cf. A192112.
%K A192113 nonn
%O A192113 1,2
%A A192113 _Clark Kimberling_, Jun 23 2011