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 A189679 #6 Apr 07 2025 15:25:34
%S A189679 1,3,6,8,11,13,15,18,20,23,24,27,29,31,34,36,39,41,43,46,47,50,52,55,
%T A189679 57,59,62,64,67,69,70,73,75,78,80,83,85,87,90,92,95,96,99,101,103,106,
%U A189679 108,111,113,115,118,119,122,124,127,129,131,134,136,139,141,142,145,147,150,152,155,157,159,162,164,167,168,170,173,175,178,180,183,185,187,190,191,194
%N A189679 n+[nr/t]+[ns/t]; r=1, s=arctan(1/2), t=arctan(2).
%C A189679 See A189677.
%t A189679 (See A189677.)
%t A189679 Table[n+Floor[n/ArcTan[2]]+Floor[(n*ArcTan[1/2])/ArcTan[2]],{n,200}] (* _Harvey P. Dale_, Apr 07 2025 *)
%Y A189679 Cf. A189677, A189678.
%K A189679 nonn
%O A189679 1,2
%A A189679 _Clark Kimberling_, Apr 25 2011