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A212805
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a(n) = (1-(n-1)/2^n)*(n!)^n.
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1
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2, 1, 3, 162, 269568, 21772800000, 128430157824000000, 78734235726376796160000000, 6793969131008738346811156070400000000, 107405833909078014660339510303458240495616000000000, 392460917103771065568880570648836410770980864000000000000000000000, 407931390497527236736237611020825246476822200409679741237329920000000000000000000000
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OFFSET
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0,1
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LINKS
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MATHEMATICA
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Table[(1-(n-1)/2^n)(n!)^n, {n, 0, 15}] (* Harvey P. Dale, Dec 30 2023 *)
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PROG
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(PARI) a(n) = (1-(n-1)/2^n)*(n!)^n; \\ Michel Marcus, Feb 27 2018
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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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