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A037568
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Base 3 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,2.
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0
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2, 7, 23, 71, 214, 644, 1934, 5803, 17411, 52235, 156706, 470120, 1410362, 4231087, 12693263, 38079791, 114239374, 342718124, 1028154374, 3084463123, 9253389371, 27760168115, 83280504346, 249841513040, 749524539122
(list; graph; refs; listen; history; internal format)
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