Be careful when counting

We define the sets of lattice points S 0 , S 1 , S_0, S_1, \ldots as S 0 = { ( 0 , 0 ) } S_0 = \{(0, 0)\} and S k S_k consisting of all lattice points that are exactly one unit away from exactly one point in S k 1 S_{k-1} . Determine the number of points in S 2017 S_{2017} .


The answer is 16384.

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