Entringer number conjecture for 000-avoiding inversion sequences
Entringer number conjecture for 000-avoiding inversion sequences
The Entringer numbers count down/up permutations of whose first entry is , and satisfy
An Entringer number conjecture asserts that, for and , is the number of inversion sequences with last entry .
This conjecture proposes a direct interpretation of the Entringer numbers in terms of 000-avoiding inversion sequences; the source reports it as suggested by computations, and no resolution is provided.
Sources & referencesView supporting material
Primary source
Sylvie Corteel, Megan A. Martinez, Carla D. Savage and Michael Weselcouch, “Patterns in Inversion Sequences I”, arXiv:1510.05434 (2016).
Progress summary
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