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Sum{T(i,n-i): i=0,1,...,n}, array T as in A047030.
0

%I #5 Mar 30 2012 18:56:51

%S 1,2,3,5,9,18,32,63,124,245,490,964,1923,3835,7652,15304,30504,60973,

%T 121866,243596,487192,973568,1946851,3893037,7784919,15569838,

%U 31132592,62262654,124519328,249028126,498056252,996046984,1992070217

%N Sum{T(i,n-i): i=0,1,...,n}, array T as in A047030.

%K nonn

%O 0,2

%A _Clark Kimberling_