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A067055
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a(n) = (n!)^(n*(n+1)/2).
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3
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1, 1, 8, 46656, 63403380965376, 15407021574586368000000000000000, 1009212044656507725162109374628859215872000000000000000000000, 46564508204734663249790730337537405675293855389346558493242680777666577039360000000000000000000000000000
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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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(Product of first n natural numbers )^(sum of first n natural numbers )
a(n) ~ (2*Pi)^(n*(n+1)/4) * n^(n*(n+1)*(2*n+1)/4) / exp((n+1)*(12*n^2 - 1)/24). - Vaclav Kotesovec, Apr 14 2023
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EXAMPLE
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a(5) = (5!)^(1+...+5) = 120^15 = 15407021574586368000000000000000. a(6) = 720^21.
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MAPLE
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MATHEMATICA
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Table[n!^(n(n + 1)/2), {n, 1, 7}]
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PROG
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(PARI): for(n=1, 7, print1(n!^sum(k=1, n, k), ", "))
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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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EXTENSIONS
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STATUS
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approved
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