login
A288562
Number of arrangements of n pseudo-circles in the affine plane with the property that every pseudo-circle intersects all the other circles.
0
1, 1, 1, 4, 45, 5108, 4598809
OFFSET
0,4
COMMENTS
Arrangements in A288559 that are connected, with the property that every pseudo-circle intersects all the other pseudo-circles.
These counts have been reduced for mirror symmetry.
See A250001, the main entry for this problem, for further information.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jun 12 2017, based on information supplied by Jon Wild on Aug 31 2016.
EXTENSIONS
a(6) from Manfred Scheucher, May 09 2018
STATUS
approved