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%I #18 Sep 16 2018 06:52:55
%S 0,0,1,2,4,5,6,8,9,11,13,14,16,18,20,22,24,26,27,29,31,34,36,38,40,42,
%T 44,46,48,51,53,55,57,59,62,64,66,69,71,73,76,78,80,83,85,88,90,92,95,
%U 97,100,102,105,107,110,112,115,117,120,122,125,127
%N a(n) = floor(n*log(n)/2).
%e a(1) = floor(1*log(1)/2) = 0;
%e a(2) = floor(2*log(2)/2) = 0.
%t Array[Floor[#*Log[#]/2] &, 70] (* _Robert G. Wilson v_, Jul 21 2018 *)
%o (PARI) a(n) = floor(n*log(n)/2); \\ _Michel Marcus_, Jul 13 2018
%Y Cf. A050504.
%K nonn,easy
%O 1,4
%A _Marcos Librán López_, Jul 10 2018
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