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Keywords: Cayley ordered Bell trees.svg lowest common ancestor of the two adjacent leaves; these heights induce a weak ordering of the gaps As shown by Arthur Cayley in 1859 the trees of this type are counted by the ordered Bell numbers 2013-03-11 19 29 08 own David Eppstein cc-zero Uploaded with UploadWizard Tree structures Weak ordering Star graph S4 Graphs with 7 vertices Graphs with 8 vertices Graphs with 10 vertices |