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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15,30,32,31,62,64,63..... (*2,+2,-1)
a,b,c,d = 1,2,4,3 b=2a c=b+2 d=c-1 7*2=14 14+2=16 16-1=15
75 (times 3, divided by2, plus 1)
15
The next number is 485.