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%I #3 Apr 22 2013 17:21:20
%S 1,2,8,64,768,15360,454656,22528000,1646198784,210411192320,
%T 38824724922368,13515210211983360,6407999879041253376,
%U 6440118524495448244224,7853658309291192797364224,24080596961115387208480587776
%N Column 1 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+1,1)}
%o for(n=0,20,print1(a(n),", "))
%Y Cf. A224798, A224799, A224800, A224802.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Apr 22 2013
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