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 A192154 #6 Oct 21 2019 14:50:22
%S A192154 0,4,6,22,40,46,48,100,214,262,316,334,340,342,1672,2158,2320,2374,
%T A192154 2392,2398,2400,10246,14620,16078,16564,16726,16780,16798,16804,16806,
%U A192154 58600,97966,111088,115462,116920,117406,117568,117622,117640,117646,117648,292102
%N A192154 Monotonic ordering of nonnegative differences 7^i-3^j, for 40>= i>=0, j>=0.
%t A192154 c = 7; d = 3; t[i_, j_] := c^i - d^j;
%t A192154 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192154 v = Union[Flatten[u ]]
%Y A192154 Cf. A192153.
%K A192154 nonn
%O A192154 1,2
%A A192154 _Clark Kimberling_, Jun 24 2011