According to a certain rule, the number of a column is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35. According to this rule, what is the seventh number in this column

According to a certain rule, the number of a column is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35. According to this rule, what is the seventh number in this column

The rule is: the nth number is 1 / [n & # 178; + (- 1) ^ (n + 1)]
So the seventh number is 1 / 50