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A329980
a(n) is the number of non-isomorphic generalized signotopes on n elements (cf. A328377) w.r.t. relabeling of the vertices.
1
1, 2, 6, 167, 63451
OFFSET
3,2
REFERENCES
H. Bergold, S. Felsner, M. Scheucher, F. Schröder, and R. Steiner, Topological Drawings meet Classical Theorems from Convex Geometry, in preparation.
LINKS
M. Balko, R. Fulek, and J. Kynčl, Crossing Numbers and Combinatorial Characterization of Monotone Drawings of K_n, Discrete & Computational Geometry, Volume 53, Issue 1, 2015, Pages 107-143.
S. Felsner and H. Weil, Sweeps, arrangements and signotopes, Discrete Applied Mathematics, Volume 109, Issues 1-2, 2001, Pages 67-94.
CROSSREFS
Sequence in context: A003189 A323841 A281819 * A199482 A168649 A135937
KEYWORD
nonn,more,hard
AUTHOR
Manfred Scheucher, Nov 26 2019
STATUS
approved