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A101610
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n! * Sum[k=1..ceiling(n/2), 1/k].
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4
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1, 2, 9, 36, 220, 1320, 10500, 84000, 828576, 8285760, 97796160, 1173553920, 16145775360, 226040855040, 3554072121600, 56865153945600, 1006228442419200, 18112111963545600, 356294637348249600
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Table[n!Sum[1/k, {k, 1, Ceiling[n/2]}], {n, 20}] (* Harvey P. Dale, Apr 25 2011 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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