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A119837
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a(n)=(2n)!/n!-(2n)!/(n-1)!.
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1
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1, 0, -12, -240, -5040, -120960, -3326400, -103783680, -3632428800, -141145804800, -6033983155200, -281585880576000, -14248245557145600, -777177030389760000, -45464856277800960000, -2839804869044183040000, -188644180586506444800000
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OFFSET
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0,3
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COMMENTS
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Row sums of number triangle A119836.
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LINKS
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FORMULA
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MATHEMATICA
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f[n_]:=Module[{n2f=(2n)!}, n2f/n!-n2f/(n-1)!]; f/@Range[0, 20] (* Harvey P. Dale, Feb 13 2011 *)
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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