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A288564
Number of connected one-sided arrangements of n pseudo-circles in the affine plane, in the sense that the union of the solid pseudo-circles is a connected set.
0
1, 1, 2, 11, 183, 30408
OFFSET
0,3
COMMENTS
Arrangements in A288563 that are connected (in the sense that the union of the solid pseudo-circles is a connected set).
These counts have not 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 13 2017, based on information supplied by Jon Wild on Aug 31 2016.
STATUS
approved