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A135475
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Sorted list of strings that can be obtained by starting with 123 and repeatedly doubling any substring in place.
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3
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123, 1123, 1223, 1233, 11123, 11223, 11233, 12123, 12223, 12233, 12323, 12333, 111123, 111223, 111233, 112123, 112223, 112233, 112323, 112333, 121123, 121223, 121233, 122123, 122223, 122233, 122323, 122333, 123123, 123223, 123233, 123323, 123333, 1111123
(list; graph; refs; listen; history; internal format)
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