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%I #3 Mar 30 2012 18:36:46
%S 1,6,57,723,11361,212151,4584081,112480887,3090105921,93988998183,
%T 3136338148017,113945190405303,4477940877230625,189296643095867847,
%U 8565988634172222609,413169192012610306263,21161884092470464784385
%N Column 1 of triangle A107717.
%C Equals one-half of column 0 of A107719 shift 1 place left.
%o (PARI) {a(n)=if(n<0,0,(matrix(n+2,n+2,m,j,if(m>=j,if(m==j,1,if(m==j+1,-3*j, polcoeff(1/sum(i=0,m-j,prod(r=0,i-1,3*r+1)*x^i)+O(x^m),m-j)))))^-1)[n+2,2])}
%Y Cf. A107717, A107719.
%K nonn
%O 0,2
%A _Paul D. Hanna_, May 30 2005
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