No label defined (Q1026)

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    Statements

    topic-id
    B.4
    0 references
    math-stackexchange-category
    combinatorics
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    number-theory
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    summation
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    proof-explanation
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    arqmath formula id
    q_22
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    post type
    Question
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    relevant answers
    3083261
    Defining formula
    ∑k=0nk(nk)=∑k=1n−1k(nk)+n=∑k=1n−1n(n−1k−1)+n=n∑k=0n−1(n−1k)=n2n−1
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