a. 3,2,3,7,18,()b. 1,3,4,6,11,19,()c. 13,14,16,21,(),76d. 1,4,16,57,()e. 2,5,28,(),3126f. 1,2,1,6,9,10,()g. 3,8,24,48,120,()h. 4,8,17,36,(),145,292i. 2,4,3,9,5,20,7,()j.4,8,8,8,32,16,128,32,()要过程,能看明白就可以。guocheng