U(1) = 64U(n+1) = -U(N)/4
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Multiply by 4
Since 16/16 = 1 and 64/16 = 4, the ratio is 1/4 or 1 to 4
Multiply each preceding term by 4.
64 4*16 = 64 2*32 = 64 1*64 = 64
The ratio of 16 to 64 is 1 to 4, because 64 is 4 times bigger than 16, and 4 is 4 times bigger than 1.