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%I #8 Nov 17 2019 01:45:30
%S 1,1,1,1,2,2,3,3,3,3,3,3,4,4,4,4,5,5,5,5,5,5,6,6,7,7,7,7,8,8,9,9,9,9,
%T 9,9,10,10,10,10,11,11,12,12,12,12,12,12,13,13,14,14,14,14,15,15,15,
%U 15,16,16,17,17,17,17,17,17,18,18,18,18,19,19,20,20,20,20,20,20,21,21,21,21
%N a(n) = #{1 <= k <= ceiling(n/2) : A000002(2k-1) = 1}.
%Y Cf. A000002.
%K nonn
%O 1,5
%A _Benoit Cloitre_, Feb 03 2009
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