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%I #3 Mar 30 2012 18:51:05
%S 1,1,1,2,2,2,3,4,4,4,4,4,5,5,6,7,7,7,7,7,7,7,7,7,8,8,8,9,10,10,11,12,
%T 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,14,14,14,15,
%U 16,17,17,17,18,19,19,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21
%N Number of numbers <= n having no isolated ones in their binary representations.
%C a(A144795(n+1)) = a(A144795(n)) + 1;
%C a(2^n - 1)) = A005251(n+1);
%C A173021(n) <= a(n) <= A173023(n).
%H R. Zumkeller, <a href="/A173022/b173022.txt">Table of n, a(n) for n = 0..10000</a>
%e a(20)=#{0,3,6,7,12,14,15}=#{0,11,110,111,1100,1110,1111}=7.
%K base,nonn
%O 0,4
%A _Reinhard Zumkeller_, Feb 07 2010
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