You could try -492 which is the result of fitting a polynomial of degree 6.
un = (-2275n6 + 50400n5 - 429250n4 + 1761750n3 - 3573475n2 + 3281850n - 918000)/9000
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10
The next number is 17. You're adding 8, and then subtracting 5. So; 2 + 8 = 10 10 - 5 = 5 5 + 8 = 13 etc... 19 - 5 = 14 14 + 8 = 22 22 - 5 = 17
7
11 and 8
35