(Q2068748)

English

Wedderburn–Etherington number

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mathematical concept

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defining formula

a_{2n-1}=\sum _{i=1}^{n-1}a_{i}a_{2n-i-1};a_{2n}={\frac {a_{n}(a_{n}+1)}{2}}+\sum _{i=1}^{n-1}a_{i}a_{2n-i}

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WikiProject Mathematics

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Freebase Data Dumps

publication date

28 October 2013

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