求下列通项公式1.2/3,4/15,6/35,8/632.1/2,2,9/2,8,25/23.1,2,2,4,3,8,4,16,5

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求下列通项公式1.2/3,4/15,6/35,8/632.1/2,2,9/2,8,25/23.1,2,2,4,3,8,4,16,5
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求下列通项公式1.2/3,4/15,6/35,8/632.1/2,2,9/2,8,25/23.1,2,2,4,3,8,4,16,5
求下列通项公式
1.2/3,4/15,6/35,8/63
2.1/2,2,9/2,8,25/2
3.1,2,2,4,3,8,4,16,5

求下列通项公式1.2/3,4/15,6/35,8/632.1/2,2,9/2,8,25/23.1,2,2,4,3,8,4,16,5
1.
an=2^n/[(2n-1)(2n+1)]
2.
an=n^2/2
3.
n为奇数时,an=(n+1)/2
n为偶数时,an=2^(n/2)

1.
an=2^n/[(2n)^2-1]
2.
an=n^2/2
3.
n为奇数时,an=(n+1)/2
n为偶数时,an=2^(n/2)