%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