Let $a_1,$ $a_2,$ $a_3,$ $\dots$ be a sequence. If \[a_n = a_{n - 1} + a_{n - 2}\] for all $n \ge 3,$ and $a_{11} = 1$ and $a_{10} = 4,$ then find $a_6.$
https://web2.0calc.com/questions/algebra_37150