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A033131
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Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,1,0.
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0
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1, 5, 20, 81, 325, 1300, 5201, 20805, 83220, 332881, 1331525, 5326100, 21304401, 85217605, 340870420, 1363481681, 5453926725, 21815706900, 87262827601, 349051310405, 1396205241620, 5584820966481, 22339283865925, 89357135463700
(list; graph; refs; listen; history; internal format)
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