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a(n)=sum(k=1,n,A000002(2*k-1))
0

%I #2 Mar 30 2012 18:39:28

%S 1,3,4,5,7,9,10,12,13,15,17,18,19,21,22,23,25,27,28,30,31,32,34,36,37,

%T 38,40,41,43,44,45,47,49,50,52,53,54,56,58,59,61,63,64,66,68,69,71,72,

%U 73,75,76,77,79,81,82,84,85,86,88,90,91,93,94,96,98,99,100,102,103,105

%N a(n)=sum(k=1,n,A000002(2*k-1))

%K nonn

%O 1,2

%A _Benoit Cloitre_, Feb 07 2009