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A037481
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Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2.
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4
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0, 1, 6, 25, 102, 409, 1638, 6553, 26214, 104857, 419430, 1677721, 6710886, 26843545, 107374182, 429496729, 1717986918, 6871947673, 27487790694, 109951162777, 439804651110, 1759218604441, 7036874417766, 28147497671065
(list; graph; refs; listen; history; internal format)
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