[social4i size="small" align="align-left"][This article was first published onYoungStatS, and kindly contributed toR-bloggers]. (You can report issue about the content on this pagehere)Want to share your content on R-bloggers?click hereif you have a blog, orhereif you don't.Meanders, monotone meanders, and Baxter permutationsVersions of the following question can be traced back at least to the work of Henri Poincaré (Poincaré (1912)):In how many ways a simple loop in the plane can cross a line a specified number of times?Despite many efforts, this question remains open after more than a centu
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