%I #7 Mar 08 2020 04:49:52
%S 0,0,0,2,3,0,0,0,0,0,0,6,4,0,0,0,0,0,0,6,12,0,0,0,0,0,0,8,0,0,0,0,0,0,
%T 0,12,15,0,0,0,0,0,0,6,12,0,0,0,0,0,0,12,12,0,0,0,0,0,0,18,0,0,0,0,0,
%U 0,0,6,24
%N a(n) = A005927(n)/2.
%K nonn
%O 0,4
%A _N. J. A. Sloane_