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A216037 Number of isomorphism classes of unstretchable simplicial arrangements of n pseudolines in the real projective plane that do not satisfy Pappus's theorem. 2
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 7, 28, 35, 136, 168, 978, 1276, 12720 (list; graph; refs; listen; history; text; internal format)
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 A057249 A246120

Adjacent sequences:  A216034 A216035 A216036 * A216038 A216039 A216040

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 30 2012

STATUS

approved

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Last modified September 18 17:45 EDT 2019. Contains 327178 sequences. (Running on oeis4.)