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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 (list; graph; refs; listen; history; text; internal format)
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
Table of n, a(n) for n=3..7.
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
Cf. A006245, A328377.
Sequence in context: A003189 A323841 A281819 * A199482 A168649 A135937
Adjacent sequences: A329977 A329978 A329979 * A329981 A329982 A329983
KEYWORD
nonn,more,hard
AUTHOR
Manfred Scheucher, Nov 26 2019
STATUS
approved

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Last modified August 29 18:55 EDT 2024. Contains 375518 sequences. (Running on oeis4.)