a(n+1) / a(n) = n / (n+1)
a(n) / a(n-1)= (n-1) / n
a(n-1)/ a(n-2)= (n-2)/(n-1)
...
a3 / a2 = 2 / 3
a2 / a1 = 1 / 2
累乘：
a(n) / a1 = 1 / n
a(n) = 1 / n
a10 = 1/10
已知数列{an}满足a1=1且（n+2）a下标n+1=n下标an则a10的值是
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