In this sequence there are actually two sequences. 1 sequence for the numerators and one sequence for the denominators. The following transformation applies to the sequence for the denominators : +10
This creates the following sequence: [-7, 3, 13, 23, 33, 43]
The following transformation applies to the sequence for the numerators: +8
This creates the following sequence: [8, 16, 24, 32, 40, 48]