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a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026703.
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%I #5 Mar 30 2012 18:56:10

%S 1,3,8,20,47,111,252,582,1303,2977,6618,15028,33269,75255,166152,

%T 374860,826115,1860407,4094612,9208832,20248703,45495079,99965896,

%U 224440544,492900919,1106034259,2428024608,5446009600,11951707547

%N a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026703.

%K nonn

%O 0,2

%A _Clark Kimberling_