105.
The sequence of number is 7.
-15 + 19 + (-26) + 11 = -41 + 30 = -11
19 - 2 - 26 = - 9
19 + (-2) + (-26) = -9
19+-26 = 19 - 26 = -7
19 + 7 = 26
11, 14, 19, 26 and 35.
20 + 7 7 + 20 8 + 19 19 + 8 9 + 18 18 + 9 10 + 17 17 + 10 11 + 16 16 + 11 15 + 12 12 + 15 14 + 13 13 +14
11 / 19 * 4 = 44/19 = 26/1911 / 19 * 4 = 44/19 = 26/1911 / 19 * 4 = 44/19 = 26/1911 / 19 * 4 = 44/19 = 26/19
18 26 33 19 27 34 20 28 35 ....
-26