Question 584344
please help 
what is the equations for 
x | y
1 | 1
2 | 1 + 2
3 | 1 + 2 + 4
4 | 1 + 2 + 4 + 8
5 | 1 + 2 + 4 + 8 + 16
6 | 1 + 2 + 4 + 8 + 16 + 32
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{{{y = 2^x - 1}}}