Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #9 Apr 06 2020 00:16:32
%S 2,8,24,64,161,385,899,2053,4617,10257,22559,49208,106601,229571,
%T 491884,1049258,2229509,4721020,9966072,20980260,44056840,92306470,
%U 192998784,402769716,839084537,1745260723,3624707293,7517790835,15572342341,32218220725,66583540100
%N a(n) = floor(2^n csc(1/n)).
%H Robert Israel, <a href="/A333186/b333186.txt">Table of n, a(n) for n = 1..3306</a>
%F a(n) = floor(2^n csc(1/n)).
%p seq(floor(2^n*csc(1/n)),n=1..100); # _Robert Israel_, Apr 05 2020
%t z = 50; u = Table[Floor[2^n Csc[1/n]], {n, 1, z}] (* A333186 *)
%t v = Table[Floor[2^n Cot[1/n]], {n, 1, z}] (* A333187 *)
%t u - v (* A333188 *)
%t w = Table[Floor[2^n Csc[1/n] - 2^n Cot[1/n]], {n, 1, z}];
%t u - v - w (* A333189 *)
%Y Cf. A333187, A333188, A333189.
%K nonn,easy
%O 1,1
%A _Clark Kimberling_, Mar 11 2020