%I #4 Mar 30 2012 19:00:09
%S 6,8,9,10,10,11,11,12,12,13,14,14,15,15,16,16,16,17,18,19,20,20,21,22,
%T 22,22,22,23,23,24,24,24,25,25,26,26,26,26,27,27,27,28,28,28,29,29,29,
%U 29,30,30,30,31,31,31,31,32,32,33,33,34,34,34,34,35,35,35
%N A189685/2
%F a(n) = A189683(2n)/2
%K nonn
%O 1,1
%A _Jonathan Sondow_, May 12 2011