1. 河内之塔 https://www.cnblogs.com/li-peng/p/3303349.html
2. 费式序列 https://blog.csdn.net/u012675743/article/details/47312119
3.巴斯卡三角形 https://www.cnblogs.com/xxNote/articles/3965362.html
4.三色旗 https://www.cnblogs.com/libra-yong/p/6296244.html