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Floor( (n/2)*log_2(2*n/3) ).
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%I #5 May 28 2020 13:01:35

%S 0,1,2,4,6,7,9,11,13,15,18,20,22,24,27,29,32,34,37,39,42,45,47,50,53,

%T 56,59,61,64,67,70,73,76,79,82,85,88,91,94,97,100,104,107,110,113,116,

%U 120,123,126,129,133,136,139,142,146,149,152,156,159,163,166,169,173,176,180

%N Floor( (n/2)*log_2(2*n/3) ).

%D A. Beygelzimer and S. Radziszowski, On halving line arrangements, Discrete Math., 257 (2002), 267-283.

%t Table[Floor[n/2 Log2[(2n)/3]],{n,2,70}] (* _Harvey P. Dale_, May 28 2020 *)

%K nonn

%O 2,3

%A _N. J. A. Sloane_, Oct 18 2002