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A006563
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(2*n)!-Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*i-1)!,i=1..n).
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0
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1, 0, 44, -174, 117256, -7589530, 2965194588, -692238710870, 349381845013136, -172725188707732914, 125191334490221307940, -102149999612542557845422, 105262879332307879142908440, -125296099002304850701565276234
(list; graph; refs; listen; history; internal format)
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