Linear Chord Diagrams with Long Chords

  • Everett Sullivan
Keywords: Linear Chord Diagram


A linear chord diagram of size $n$ is a partition of the set $\{1,2,\dots,2n\}$ into sets of size two, called chords. From a table showing the number of linear chord diagrams of degree $n$ such that every chord has length at least $k$, we observe that if we proceed far enough along the diagonals, they are given by a geometric sequence. We prove that this holds for all diagonals, and identify when the effect starts.
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