三阶齐次线性递推四则

1. \(a_n=9a_{n-1}-26a_{n-2}+24a_{n-3},a_1=9,a_2=29,a_3=99\)
2. \(a_n=7a_{n-1}-16a_{n-2}+12a_{n-3},a_1=5,a_2=17,a_3=51\)
3. \(a_n=6a_{n-1}-12a_{n-2}+8a_{n-3},a_1=2,a_2=16,a_3=72\)
4. \(a_n=4a_{n-1}-6a_{n-2}+4a_{n-3},a_1=a_2=a_3=4\)