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A037551
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Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2,2.
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0
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1, 12, 122, 1221, 12212, 122122, 1221221, 12212212, 122122122, 1221221221, 12212212212, 122122122122, 1221221221221, 12212212212212, 122122122122122, 1221221221221221
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