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A306241
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a(n) = Sum_{k=0..n} (k*n)!/n!^k.
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1
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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) equals (row sums of A120666) + 1.
a(n) ~ n^(n^2 - n/2 + 1) / (exp(1/12) * (2*Pi)^((n-1)/2)). (End)
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MATHEMATICA
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Table[Sum[(k*n)!/n!^k, {k, 0, n}], {n, 0, 10}] (* Vaclav Kotesovec, Feb 08 2019 *)
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PROG
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(PARI) {a(n) = sum(k=0, n, (k*n)!/n!^k)}
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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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