作者assassin88 (2010)
看板Grad-ProbAsk
标题[理工] [离散]-递回
时间Sun Feb 7 15:46:25 2010
For n >= 1, let an be the number of ways to write n as an ordered sum of
positive integer where each summand is at least 2.
请问这一题要怎麽想？
完全没有idea..麻烦指导了~感谢！
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