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%I #15 Feb 17 2016 15:31:19
%S 1,3,8,20,46,100,210,432,878,1772,3562,7144,14310,28644,57314,114656,
%T 229342,458716,917466,1834968,3669974,7339988,14680018,29360080,
%U 58720206,117440460,234880970,469761992,939524038,1879048132
%N a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026615.
%F G.f.: (1-x+x^2+x^3)/[(1-x)^2*(1-2x)] (conjectured). Cf. A026622. - _Ralf Stephan_, Feb 05 2004
%K nonn
%O 0,2
%A _Clark Kimberling_
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