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A006547
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Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*i-1)!,i=1..n).
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0
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0, 2, -20, 894, -76936, 11218330, -2486192988, 779417002070, -328459055125136, 179127562413460914, -122758432482044667940, 103274000340320165525422, -104642430930574639703548440, 125699390463431456337149276234
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