Find the rule: 2 / 3 1 / 2 2 / 5 1 / 3 2 / 7 1 / 4

The single item is 2 / 32 / 52 / 7, the numerator is 2, and the odd denominator is 357911
The binomial is 1 / 21 / 31 / 4, the numerator is 1, and the denominator is 23456
If it continues, it should be 2 / 3 1 / 2 2 / 5 1 / 3 2 / 7 1 / 4 2 / 9 1 / 5 2 / 11 1 / 6

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