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A275924
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.
24
1, 1, 1, 6, 112, 15502
OFFSET
0,4
COMMENTS
Arrangements in A250001 that are connected, in the sense that the union of the (boundaries of the) circles is a connected set. See A250001, the main entry for this problem, for further information.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Aug 29 2016, based on information supplied by Jon Wild.
EXTENSIONS
a(5) corrected by Jon Wild, Aug 31 2016
STATUS
approved