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A048349
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a(n)^2 is the smallest square containing exactly n 4's.
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1
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2, 12, 38, 212, 2538, 6888, 66592, 210771, 2059962, 6696592, 21081538, 209868112, 664488107, 3800598038, 18613286762, 209820981888
(list; graph; refs; listen; history; internal format)
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