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A037730
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Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,0,3.
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2, 9, 36, 147, 590, 2361, 9444, 37779, 151118, 604473, 2417892, 9671571, 38686286, 154745145, 618980580, 2475922323, 9903689294, 39614757177, 158459028708, 633836114835, 2535344459342, 10141377837369, 40565511349476
(list; graph; refs; listen; history; internal format)
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