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Central column a(n,[n/2]) of A059922.
1

%I #3 Mar 30 2012 16:49:03

%S 1,1,2,3,10,41,1682,346493,120057399050,51458022952549550101,

%T 2647928126185116317725365841617509110202,

%U 505756353132539355991535788904396967700352784465846135098293311191732045

%N Central column a(n,[n/2]) of A059922.

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Feb 09 2001