A180500
Triangle read by row. T(n,m) gives the number of isomorphism classes of simple arrangements of n pseudolines and m double pseudolines in the projective plane.
Original entry on oeis.org
1, 1, 1, 1, 1, 1, 1, 2, 4, 13, 1, 5, 48, 626, 6570, 1, 25, 1329, 86715, 4822394, 181403533
Offset: 0
- 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.
See
A180501 for isomorphism classes of all (not only simple) arrangements of n pseudolines and m double pseudolines in the projective plane.
See
A180503 for isomorphism classes of simple arrangements of n pseudolines and m double pseudolines in the Moebius strip.
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.
Original entry on oeis.org
1, 1, 1, 1, 1, 1, 1, 5, 17, 59, 3, 45, 799, 15649, 245351
Offset: 0
- 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.
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.
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