(1)1,2,10,30,68,.
(2)1,2,9,64,625 =1^0,2^1,3^2 ,4^3,5^4
(3)1,1,2,6,24,120.=1,1*1,1*2,2*3,6*4,24*5
(4)0,3/25,1/2,5/3,6,