用后一个数减前一个数,重复三次,有1,2,5,11,22,42,791,3,6,11,20,372,3,5,9,171,2,4,8我想,你已经看出规律了1,2,5,11,22,42,79,1491,3,6,11,20,37,702,3,5,9,17,331,2,4,8,16答案是149 规律是 an=2^(n-1)+(n-1)*(n-2...