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简单公式

Posted by lddlinan at 2021-03-09 17:46:21 on Problem 3875 
如果v>0 f(0)=0 否则 f(0)=1
f(1)=1
f(n) = (C(2**n, n-1)-f(n-2)*(2**n-(n-2)))/n
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