n^2
an= --------- (分数线）
(n-1)^2
理由：n^2=a1*...*an
(n-1)^2=a1*...*an-1
又因为(a1*...*an)/(a1*...*an-1)=a1/a1*a2/a2*...*an-1/an-1*an=an
所以
n^2
an= ---------
(n-1)^2
数列｛an｝满足关系a1=1,a1*a2*a3……an=n^2(n属于N*）,an=
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