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A180502
Triangle read by row. T(n,m) gives the number of isomorphism classes of arrangements of n pseudolines and m double pseudolines in the Moebius strip.
2
1, 1, 1, 1, 1, 1, 1, 5, 17, 59, 3, 45, 799, 15649, 245351
OFFSET
0,8
REFERENCES
J. Ferté, V. Pilaud and M. Pocchiola, On the number of arrangements of five double pseudolines, Abstracts 18th Fall Workshop on Comput. Geom. (FWCG08), Troy, NY, October 2008.
LINKS
J. Ferté, V. Pilaud and M. Pocchiola, On the number of simple arrangements of five double pseudolines, arXiv:1009.1575 [cs.CG], 2010; Discrete Comput. Geom. 45 (2011), 279-302.
CROSSREFS
See A180503 for isomorphism classes of simple arrangements of n pseudolines and m double pseudolines in the Moebius strip.
See A180501 for isomorphism classes of arrangements of n pseudolines and m double pseudolines in the projective plane.
First diagonal gives A063854.
Sequence in context: A146697 A009229 A010914 * A261515 A171838 A105392
KEYWORD
nonn,tabl,more
AUTHOR
Vincent Pilaud, Sep 08 2010
STATUS
approved