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A037487
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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.
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1
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1, 12, 121, 1212, 12121, 121212, 1212121, 12121212, 121212121, 1212121212, 12121212121, 121212121212, 1212121212121, 12121212121212, 121212121212121, 1212121212121212
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