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arxiv: 1511.09455 · v1 · pith:U4VRNEWPnew · submitted 2015-11-30 · 🧮 math.CO

Non-ambiguous trees: new results and generalisation

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keywords natstreesformulanon-ambiguousbinarycombinatoriallydefinitiondescribed
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We present a new definition of non-ambiguous trees (NATs) as labelled binary trees. We thus get a differential equation whose solution can be described combinatorially. This yield a new formula for the number of NATs. We also obtain q-versions of our formula. And we generalize NATs to higher dimension.

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