Find the law, the faster! Give more. 1,1,2,3,5 {} 13,21,34 {} 89

Find the law, the faster! Give more. 1,1,2,3,5 {} 13,21,34 {} 89

Let the nth number be xn, n-1 = a, n-2 = B, then xn = XA + XB
The answers are 8,55 in turn!