A216037 Number of isomorphism classes of unstretchable simplicial arrangements of n pseudolines in the real projective plane that do not satisfy Pappus's theorem.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 7, 28, 35, 136, 168, 978, 1276, 12720

Offset

2,14

Comments

Near-pencil arrangements are excluded.

Links

Table of n, a(n) for n=2..24.

M. Cuntz, Simplicial Arrangements with up to 27 Lines, arXiv:1108.3000 [math.CO], 2011.

M. Cuntz, Simplicial Arrangements with up to 27 Lines, Discrete Comput. Geom. 48 (2012), no. 3, 682--701. MR2957638.

Crossrefs

Cf. A216037, A216038.

Sequence in context: A243795 A060112 A057914 * A250547 A366061 A057249

Adjacent sequences: A216034 A216035 A216036 * A216038 A216039 A216040

Keyword

nonn,more

Author

N. J. A. Sloane, Aug 30 2012

Status

approved