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A134236
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Ternary numbers with equal numbers of 0s, 1s and 2s and such that read left-to-right at all times the number of 2s >= number of 1s >= number of 0s.
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210, 210210, 212010, 212100, 221010, 221100, 210210210, 210212010, 210212100, 210221010, 210221100, 212010210, 212012010, 212012100, 212021010, 212021100, 212100210, 212102010, 212102100, 212120010, 212120100, 212121000, 212201010
(list; graph; refs; listen; history; internal format)
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