遞迴數列考題整理
https://blog.xuite.net/wang620628/twblog/126093912
數學傳播-張春福遞迴式
https://web.math.sinica.edu.tw/math_media/d334/33404.pdf
https://web.math.sinica.edu.tw/math_media/d341/34104.pdf
https://www.facebook.com/SteppSchool/videos/968855786851530
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