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A037674
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Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,2,3.
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0
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1, 4, 18, 75, 301, 1204, 4818, 19275, 77101, 308404, 1233618, 4934475, 19737901, 78951604, 315806418, 1263225675, 5052902701, 20211610804, 80846443218, 323385772875, 1293543091501, 5174172366004, 20696689464018, 82786757856075
(list; graph; refs; listen; history; internal format)
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