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Floor( n*log_2(4*n/3) ).
0

%I #7 Sep 03 2013 13:54:30

%S 0,2,6,9,13,18,22,27,32,37,42,48,53,59,64,70,76,82,88,94,100,107,113,

%T 120,126,133,139,146,152,159,166,173,180,187,194,201,208,215,222,229,

%U 236,243,251,258,265,273,280,288,295,302,310,318,325,333,340,348,356,363,371,379

%N Floor( n*log_2(4*n/3) ).

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

%t Table[Floor[n*Log[2,(4n)/3]],{n,60}] (* _Harvey P. Dale_, Sep 03 2013 *)

%K nonn

%O 1,2

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

%E Corrected by _Harvey P. Dale_, Sep 03 2013