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A224802
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Column 2 of triangle A224798.
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4
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1, 4, 16, 192, 2816, 84992, 3223552, 247250944, 23344644096, 4762175799296, 1120173091192832, 644677614732050432, 378488143248684482560, 653528083344895592366080, 949029769901509397631205376, 5192644934824847025023714590720
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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PROG
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(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) ))))}
for(n=0, 15, print1(a(n), ", "))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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