%I #17 Sep 08 2022 08:45:59
%S 0,2,3,4,6,7,8,10,11,12,13,15,16,17,19,20,21,22,24,25,26,28,29,30,32,
%T 33,34,35,37,38,39,41,42,43,44,46,47,48,50,51,52,54,55,56,57,59,60,61,
%U 63,64,65,66,68,69,70,72,73,74,75,77,78,79,81,82,83,85,86,87,88
%N a(n) = 2*n - floor(n*sqrt(1/2)).
%H Vincenzo Librandi, <a href="/A195128/b195128.txt">Table of n, a(n) for n = 0..10000</a>
%t Table[2n-Floor[n Sqrt[1/2]],{n,0,70}] (* _Harvey P. Dale_, Feb 04 2019 *)
%o (Magma) [2*n-Floor(n*(Sqrt(1/2))): n in [0..70]]; // _Vincenzo Librandi_, Sep 12 2011
%K nonn
%O 0,2
%A _Clark Kimberling_, Sep 09 2011