Number of simple mixed arrangements of n pseudolines and 1 double pseudoline in the Mobius plane.
A191955
Number of simple mixed arrangements of n pseudolines and 1 double pseudoline in the Mobius plane.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =122a(5) =2445a(6) =102413a(7) =7862130
External references
- oeis: A191955