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A291676
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Main diagonal of A291656.
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3
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = ((2n-1)!!)^n * Sum_{i=1..n} 1/(2*i-1)^n.
a(n) ~ 2^(n*(2*n + 1)/2) * n^(n^2) / exp(n^2 + 1/24). - Vaclav Kotesovec, Sep 25 2020
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MATHEMATICA
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Table[((2*n - 1)!!)^n * Sum[1/(2*k - 1)^n, {k, 1, n}], {n, 0, 10}] (* Vaclav Kotesovec, Sep 25 2020 *)
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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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