Multiply each preceding term by 4.
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Every number is double the previous number, where the first number is 1.
Multiply by 4
Since 16/16 = 1 and 64/16 = 4, the ratio is 1/4 or 1 to 4
64 4*16 = 64 2*32 = 64 1*64 = 64
U(1) = 64U(n+1) = -U(N)/4