Search: id:A155051
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%I A155051
%S A155051 1,2,3,4,6,8,13,18,32,46,88,130,262,394,823,1252,2682,4112,8974,13836,
%T A155051 30632,47428,106214,165000,373012,581024,1323924,2066824,4741264,
%U A155051 7415704,17110549,26805394,62163064,97520734,227165524
%N A155051 Expansion of c(x^2)*(1+x)/(1-x), c(x) the g.f. of A000108.
%C A155051 Row sums of A155050.
%F A155051 a(n)=2*sum{k=0..n, C(k/2)(1+(-1)^k)/2}-C(n/2)(1+(-1)^n)/2, C(n)=A000108;
%F A155051 a(n)=(C(n/2)+2*sum{k=0..(n/2-1), C(k)})*(1+(-1)^n)/2+sum{k=0..n/2, C(k)}*(1-(-1)^n), 
               C(n)=A000108.
%Y A155051 Sequence in context: A094372 A039880 A000029 this_sequence A018137 A084239 
               A049708
%Y A155051 Adjacent sequences: A155048 A155049 A155050 this_sequence A155052 A155053 
               A155054
%K A155051 easy,nonn
%O A155051 0,2
%A A155051 Paul Barry (pbarry(AT)wit.ie), Jan 19 2009

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