0,-1,4,-9,16,-25,36...第n个数是

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0,-1,4,-9,16,-25,36...第n个数是
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0,-1,4,-9,16,-25,36...第n个数是
0,-1,4,-9,16,-25,36...第n个数是

0,-1,4,-9,16,-25,36...第n个数是
f(n) = (-1)^n * (n ^2),
能看明白吗?这是个函数,n是偶数时,取正数的平方数,否则取负数的平方数.
急需一个优评.