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Re:递推公式 a[i]=2*(a[i-1]+a[i-2]*(i-1)) ?

Posted by 19880901 at 2009-05-17 19:15:47 on Problem 3734
In Reply To:Re:递推公式 a[i]=2*(a[i-1]+a[i-2]*(i-1)) ? Posted by:phoenixwright at 2009-05-17 13:17:38 
> 话说偶用生成函数推出这个式子来的，，纯代数思想，不过这个可有组合数学的解释??，，~0~
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