The enumeration of permutations avoiding 2143 and 4231

Albert, M. H.; Atkinson, M. D. and Brignall, Robert (2011). The enumeration of permutations avoiding 2143 and 4231. Pure Mathematics and Applications, 22(2) pp. 87–98.

URL: http://www.mat.unisi.it/newsito/puma/public_html/2...

Abstract

We enumerate the pattern class Av(2143, 4231) and completely describe its permutations. The main tools are simple permutations and monotone grid classes.

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