漸化式の解法

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• a_1=2,a_{n+1}=2a_n+3
• a_1=1,a_2=1,2,a_{n+2}=a_{n+1}+a_n
• a_1=1,a_{n+1}=2a_n+n^2
• a_1=0,a_{n+1}=1/(2-a_n)