Respuesta :

 2**n. (That's two to the nth power: 2 to the first, 2 to the second (or two squared), 2 to the third (or two cubed), 2 to the fourth, etc.) 

2**1 = 2 = 2 
2**2 = 2 * 2 = 4 
2**3 = 2 * 2 * 2 = 8 
2**4 = 2 * 2 * 2 * 2 = 16 

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