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A110181
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Row sums of number triangle A110180.
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1
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1, 2, 3, 6, 15, 42, 131, 432, 1497, 5420, 20373, 79422, 319927, 1328764, 5677653, 24904584, 111961129, 515029020, 2421047613, 11616330342, 56829235095, 283211069352, 1436529522233, 7410596379456, 38852645340297
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n)=sum{k=0..n, sum{j=0..floor((n-k)/2), C(n-k, j)C(n-k-j, j)k^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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