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%I
%S 1,2,14,138,1522,17740,213642,2628626,32833226,414697740,5282720764,
%T 67750624480,873653602902,11316723314858,147143725788662,
%U 1919360958676866,25105597581410410,329174706398378884,4325098764217263996,56934186664360843064
%N Central terms of the triangle in A059283.
%C a(n) = A059283(2*n,n).
%o (Haskell)
%o a224729 n = a059283 (2*n) n
%K nonn
%O 0,2
%A _Reinhard Zumkeller_, Apr 17 2013
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