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It looks to me as though the pattern is x2, +2, -1
1x2=2 2+2=4 4-1=3
3x2=6 6+2=8 8-1=7
7x2=14 14+2=16 16-1=15
15x2=30 30+2=32 32-1=31
So the next few terms are 15, 30, 32, 31, 62, 64, 63
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