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A255269
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a(n) = Product_{k=1..n} k!^k.
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17
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) ~ sqrt(A) * exp((3 - 45*n^2 - 32*n^3 - 9*Zeta(3)/Pi^2)/72) * n^((8*n^3 + 18*n^2 + 10*n + 1)/24) * (2*Pi)^(n*(n+1)/4), where A = A074962 = 1.28242712910062263687534256886979... is the Glaisher-Kinkelin constant and Zeta(3) = A002117 = 1.2020569031595942853997... .
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MATHEMATICA
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Table[Product[k!^k, {k, 1, n}], {n, 1, 10}]
FoldList[Times, Table[(k!)^k, {k, 10}]] (* Harvey P. Dale, Aug 16 2021 *)
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CROSSREFS
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KEYWORD
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nonn,changed
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AUTHOR
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STATUS
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approved
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