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%I #3 Apr 22 2013 17:19:03
%S 1,2,10,72,768,12288,299008,11255808,664469504,62483333120,
%T 9489129406464,2346169518784512,965147017850388480,
%U 649688423266242265088,756273236725760736100352,1402615188204296734861426688,4805236684377633046446974435328
%N Column 0 of the matrix square of triangle A224798.
%o (PARI) {A224798(n, k)=if(n<k|k<0, 0, if(n==k, 1, if(n==k+1, 2^(n-1), sum(j=k+1, n, A224798(n, j)*A224798(j, k+1) ))))}
%o {a(n)=local(M=matrix(n+1,n+1,r,c,if(r>=c,A224798(r-1,c-1))));(M^2)[n+1,1]}
%o for(n=0,16,print1(a(n),", "))
%Y Cf. A224798, A224800, A224801, A224802.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Apr 22 2013
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