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A037567
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Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,2,1.
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0
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2, 22, 221, 2212, 22122, 221221, 2212212, 22122122, 221221221, 2212212212, 22122122122, 221221221221, 2212212212212, 22122122122122, 221221221221221, 2212212212212212
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