There is a column of numbers, the first number is 22, the second number is 12, starting from the third number, each number is the average of the two numbers before it, the integer part of the 10th number in this column is How many
有一列数，第1个数是22，第2个数是12，从第3个数开始，每个数是它前面两个数的平均数，这列数的第10个数的整数部分是多少
<result>15</result>