On $k$-crossings and $k$-nestings of permutations
Discrete mathematics & theoretical computer science, DMTCS Proceedings vol. AN, 22nd International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2010), DMTCS Proceedings vol. AN, 22nd International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2010) (2010).

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We introduce $k$-crossings and $k$-nestings of permutations. We show that the crossing number and the nesting number of permutations have a symmetric joint distribution. As a corollary, the number of $k$-noncrossing permutations is equal to the number of $k$-nonnesting permutations. We also provide some enumerative results for $k$-noncrossing permutations for some values of $k$.
@article{DMTCS_2010_special_259_a68,
     author = {Burrill, Sophie and Mishna, Marni and Post, Jacob},
     title = {On $k$-crossings and $k$-nestings of permutations},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {DMTCS Proceedings vol. AN, 22nd International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2010)},
     year = {2010},
     doi = {10.46298/dmtcs.2873},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.2873/}
}
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Burrill, Sophie; Mishna, Marni; Post, Jacob. On $k$-crossings and $k$-nestings of permutations. Discrete mathematics & theoretical computer science, DMTCS Proceedings vol. AN, 22nd International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2010), DMTCS Proceedings vol. AN, 22nd International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2010) (2010). doi : 10.46298/dmtcs.2873. http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.2873/

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