128, 512, ...
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1/2 then 1/4 1/8 1/16 1/32
32, -64 (you are doubling and reversing sign, i.e. multiplying by -2)
It is 9 followed by 32
this cannot be solved, as there is no pattern...
It appears as if the pattern is doubling, therefore the next three numbers are 16, 32, and 64.