A329980 a(n) is the number of non-isomorphic generalized signotopes on n elements (cf. A328377) w.r.t. relabeling of the vertices.

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

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