f(1)=1,f(2)=5,f(3)=13,f(4)=25,求f(n)=
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f(1)=1,f(2)=5,f(3)=13,f(4)=25,求f(n)=
f(1)=1,f(2)=5,f(3)=13,f(4)=25,求f(n)=
f(1)=1,f(2)=5,f(3)=13,f(4)=25,求f(n)=
等于2的1次方一直加到2的n次方
n*n+n-1