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1, 1, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 8, 8, 0, 0, 16, 16, 0, 0, 32, 32, 0, 0, 64, 64, 0, 0, 128, 128, 0, 0, 256, 256, 0, 0, 512, 512, 0, 0, 1024, 1024, 0, 0, 2048, 2048, 0, 0, 4096, 4096, 0, 0, 8192, 8192, 0, 0, 16384, 16384, 0, 0, 32768
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,5
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COMMENTS
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LINKS
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FORMULA
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a(n)=sum{k=0..n, sum{i=0..n, (-1)^(n-i)*C(n,i)*sum{j=0..i-k, C(k,2j)*C(i-k,2j)*2^j}}}.
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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