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%I #5 Nov 17 2019 01:36:22
%S 0,0,1,1,1,1,1,1,2,2,3,3,3,3,4,4,4,4,5,5,6,6,6,6,6,6,7,7,7,7,7,7,8,8,
%T 9,9,9,9,10,10,10,10,10,10,11,11,12,12,12,12,12,12,13,13,13,13,14,14,
%U 14,14,14,14,15,15,16,16,16,16,17,17,17,17,17,17,18,18,19,19,19,19,20,20
%N a(n) = #{1 <= k <= ceiling(n/2) : A000002(2k-1) = 2}.
%K nonn
%O 1,9
%A _Benoit Cloitre_, Feb 03 2009