A max-tree mapping on d-permutations avoiding (21,12) and 231 is bijective with d-ary trees, resolving a conjecture on their enumeration.
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Max-tree for d-permutations and pattern avoidance
A max-tree mapping on d-permutations avoiding (21,12) and 231 is bijective with d-ary trees, resolving a conjecture on their enumeration.