找规律0,1,3,8,21,...

问题描述:

找规律0,1,3,8,21,...
找规律填数0,.1,3,8,21...

0,1,3,8,21,55,144...
1*3-0=3
3*3-1=8
8*3-3=21
21*3-8=55
55*3-21=144