规律探究:5,12,21,32…第N个

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规律探究:5,12,21,32…第N个

规律探究:5,12,21,32…第N个
规律探究:5,12,21,32…第N个

规律探究:5,12,21,32…第N个
(n+2)*(n+2)/(n+2)*(n+2)-4