如何求 f(i)=f(i−1)+f(i−2)+n2f(i)=f(i-1)+f(i-2)+n^2f(i)=f(i−1)+f(i−2)+n2，只知道转移的要从 f(i−1),f(i−2),n2,n,1f(i-1),f(i-2),n^2,n,1f(i−1),f(i−2),n2,n,1 来，求具体的转移 basebasebase 矩阵
