2，2，4,5,6,8,8，（11），（10）双重数列。奇数列2,4,6,8,10...是公差为2的等差数列。偶数列2,5,8,11.....是公差为3的等差数列。
2,2,4,5,6,8,8,(11),(10)
2,2,4,5,6,8,8,11,10
