a(n) = moebius(n)- moebius(n/2) where moebius(n) is zero if n is not an integer. 1, 2, 1, 1, 1, 2, 1, 0, 0, 2, 1, 1, 1, 2, 1, 0, 1, 0, 1, 1, 1, 2, 1, 0, 0, 2, 0, 1
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