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A037617
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Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3,2.
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0
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1, 13, 132, 1321, 13213, 132132, 1321321, 13213213, 132132132, 1321321321, 13213213213, 132132132132, 1321321321321, 13213213213213, 132132132132132, 1321321321321321
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