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.

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

Table of n, a(n) for n=0..14.

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

Adjacent sequences: A180499 A180500 A180501 * A180503 A180504 A180505

Keyword

nonn,tabl,more

Author

Vincent Pilaud, Sep 08 2010

Status

approved