It looks like this sequence is derived from +7,-4,+8,-3,+9,-2.
Therefore, the next term would be 17+10 = 27.
The next number in the sequence is 27.
20
31
10 (between 7 and 13)
22
that best completes the sequence 2 9 5 13 10 19 17 is 27.
Arithmetic- the number increases by 10 every term.
27
35
11
11
342