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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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