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A224801
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Column 1 of triangle A224798.
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4
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1, 2, 8, 64, 768, 15360, 454656, 22528000, 1646198784, 210411192320, 38824724922368, 13515210211983360, 6407999879041253376, 6440118524495448244224, 7853658309291192797364224, 24080596961115387208480587776
(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, 20, 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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