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 A190189 #9 Dec 29 2017 15:56:20
%S A190189 3,6,7,9,10,11,14,17,20,21,22,23,28,30,31,33,34,39,41,42,44,45,46,49,
%T A190189 52,53,55,56,58,60,63,66,67,68,69,74,77,78,79,80,81,85,87,88,90,91,92,
%U A190189 98,99,101,102,104,109,110,112,113,115,116,117,120
%N A190189 Positions of 0 in A190188; complement of A190190.
%C A190189 See A190188.
%H A190189 G. C. Greubel, <a href="/A190189/b190189.txt">Table of n, a(n) for n = 1..5550</a>
%t A190189 u = E; v = 1/E;
%t A190189 f[n_] := Floor[n*u + n*v] - Floor[n*u] - Floor[n*v]
%t A190189 t = Table[f[n], {n, 1, 120}] (* A190188 *)
%t A190189 Flatten[Position[t, 0]] (* A190189 *)
%t A190189 Flatten[Position[t, 1]] (* A190190 *)
%Y A190189 Cf. A190188, A190190.
%K A190189 nonn
%O A190189 1,1
%A A190189 _Clark Kimberling_, May 05 2011