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A288567
Number of connected arrangements of n circles in the affine plane, in the sense that the union of the boundaries of the circles is a connected set and every circle intersects all the other circles.
0
1, 1, 1, 3, 21, 980
OFFSET
0,4
COMMENTS
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 13 2017, based on information supplied by Jon Wild.
STATUS
approved