0,1/2,0,1/4,0,1/6,0,……的通项公式怎么求

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0,1/2,0,1/4,0,1/6,0,……的通项公式怎么求
0,1/2,0,1/4,0,1/6,0,……的通项公式怎么求

0,1/2,0,1/4,0,1/6,0,……的通项公式怎么求
{0 (n为奇数)
{1/n (n为偶数)
或者an=/ sin【(π/2)*n】/n /
/ /为绝对值

x=0/n,当n为奇数时
x=1/n,当n为偶数时

an=[(-1)^n+1]/(2*n)

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