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%I #3 Apr 22 2013 17:20:22
%S 1,1,4,24,224,3200,70144,2394112,127279104,10863804416,1461901721600,
%T 329015240425472,116091248328048640,72663237440661618688,
%U 68393195123465340846080,125216718860772304085843968,312478055025316083026815352832
%N Column 0 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)=A224798(n,0)}
%o for(n=0,16,print1(a(n),", "))
%Y Cf. A224798, A224799, A224801, A224802.
%K nonn
%O 0,3
%A _Paul D. Hanna_, Apr 22 2013
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