Given an integer n, return the coefficients
c = [c_n,c_n-1,...,c_0]
10^n = c_n*4^(n) + c_n-1*4^(n-1) +...+ c_0*4^(0)
With the constraint that
c_n = c_0
n = 1
10^n = 10 = 2*4^(1) + 2*4^(0), so c = [2 2]
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