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%I #3 Mar 30 2012 18:59:08
%S 1,0,-1,2,11,12,19,174,1073,6584,45871,337098,2563293,20346204,
%T 169904575,1501012310,14065496355,139601710224,1460544299739,
%U 16007830782402,182743810845223,2163753452707580,26506423427738891,335585442530912862,4389743577358599363
%N Diagonal sums of a scaled Legendre triangle.
%C Diagonal sums of A110124.
%F a(n)=sum{k=0..floor(n/2), 2^(n-2k)*LegendreP(n-2k, k)}.
%K easy,sign
%O 0,4
%A _Paul Barry_, Jul 13 2005
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