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A129127
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An irregular table of node numbers (in order of appearance) which generate two children in the tree described by A128628 and A129129.
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1
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2, 3, 5, 6, 7, 10, 11, 14, 15, 18, 13, 22, 21, 30, 17, 26, 33, 35, 42, 50, 54, 19, 34, 39, 55, 66, 70, 75, 90
(list; graph; refs; listen; history; internal format)
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