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A130838
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Sorted list of strings that can be obtained by starting with 12 and repeatedly doubling any substring in place.
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2
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12, 112, 122, 1112, 1122, 1212, 1222, 11112, 11122, 11212, 11222, 12112, 12122, 12212, 12222, 111112, 111122, 111212, 111222, 112112, 112122, 112212, 112222, 121112, 121122, 121212, 121222, 122112, 122122, 122212, 122222
(list; graph; refs; listen; history; internal format)
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