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A088979
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a(n) = n! - ((n-1)!!)^2.
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1
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1, 2, 15, 56, 495, 2736, 29295, 215424, 2735775, 25171200, 370945575, 4103654400, 68916822975, 891494553600, 16813959537375, 249145395609600, 5214921734397375, 87125481883238400, 2004231846526284375, 37283094761472000000, 934957186489800849375
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listen;
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OFFSET
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2,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[CoefficientList[Series[1/(1-x)-(1+ArcSin[x])/Sqrt[1-x^2], {x, 0, 20}], x][[n]](n-1)!, {n, 3, 20}] (* Benedict W. J. Irwin, Oct 14 2016 *)
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CROSSREFS
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KEYWORD
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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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