如何利用2*1个方格的板子，将3*n的板子完全覆盖？这个程序就解决了这个问题。其实编程的难度不大，重点是解决了数学中一个递推关系的问题。-How to use 2* a checkered board, the 3* n board completely covered? This program solves this problem. In fact, programming is not difficult, the focus is to solve a mathematical pro