将这个数列乘以2得2,2,4,4,6,6,8,8
可以看出这个数列是由1,2,3,4,5,6,7,8.an = n
和数列 1,0,1,0,1,0,1,0,.an = 1/2*(1-(-1)^n)
相加而得到,所以这个数列通项公式是【n+1/2*(1-(-1)^n)】/2
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