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A153829
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Index sequence to A089840: positions of bijections that preserve A153835, or equivalently, A127302 (the non-oriented form of binary trees).
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8
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0, 1, 3, 7, 15, 21, 27, 46, 68, 73, 74, 83, 84, 87, 88, 92, 114, 149, 169, 183, 184, 189, 190, 199, 202, 203, 225, 251, 252, 254, 261, 262, 268, 269, 270, 271, 299, 400, 515, 537, 539, 573, 575, 591, 593, 638, 753, 871, 894, 895, 990, 995, 996, 1110, 1132
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listen;
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internal format)
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OFFSET
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0,3
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COMMENTS
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These elements form a subgroup in A089840 (A089839). Such elements consists of only such clauses where each vertex stays at the same distance from the root of the binary tree and in the image tree will still be sibling to its original sibling in the pre-image tree.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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