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.
References
Primary source
Sylvie Corteel, Megan A. Martinez, Carla D. Savage and Michael Weselcouch, “Patterns in Inversion Sequences I”, arXiv:1510.05434 (2016).
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