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%I #13 Aug 05 2013 13:45:24
%S 1,4,20,108,632,4060,28968,231000,2058096,20375964,222393800,
%T 2653879624,34365597840,479776469848,7181892528272,114731622081840,
%U 1948073992109280,35031456100431900,665075537735997960,13292908401187179240,279000321119414475600
%N Central terms of the triangle in A074911.
%C a(n) = A074911(2*n-1,n).
%o (Haskell)
%o a225621 n = a074911 (2 * n - 1) n
%Y Cf. A227791.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Aug 05 2013
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