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题目:由数列1,1+2+1,1+2+3+2+1,1+2+3+4+3+2+1,…前4项的值,推测第n项的结果,并给出证明.
Title: The result of the nth item is presumed from the values of the first 4 terms of the sequence 1,1 + 2 + 1,1 + 2 + 3 + 2 + 1,1 + 2 + 3 + 4 + 3 + 2 + And give proof.