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预先把各个节点所能形成的树的个数放到一个数组里

Posted by yogafrank at 2007-07-30 10:01:55 on Problem 1095
In Reply To:看了题目懂了, 但是没有好的思路. 大虾帮助下啊! 谢谢. Posted by:yogafrank at 2007-07-29 11:59:12 
long c[19]={1,1,2,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,9694845,35357670,129644790,477638700};

这是怎么计算的呢?
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