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A156248 a(n)=sum(k=1,n,(-1)^k*A000002(2*k)) 0

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

%S -2,-1,-3,-1,-2,0,-1,0,-2,-1,-2,0,-2,-1,-3,-2,-3,-1,-3,-2,-4,-2,-3,-2,

%T -4,-3,-5,-3,-4,-2,-4,-3,-5,-4,-5,-3,-5,-4,-5,-3,-4,-2,-3,-2,-4,-2,-3,

%U -1,-2,0,-2,-1,-2,0,-2,-1,-3,-2,-3,-1,-2,-1,-3,-2,-3,-1,-2,0,-2,-1,-3

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

%K sign

%O 1,1

%A _Benoit Cloitre_, Feb 07 2009

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Last modified April 24 06:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)