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A288565 Number of connected one-sided arrangements of n pseudo-circles in the affine plane, in the sense that the union of the boundaries of the pseudo-circles is a connected set. 0
1, 1, 1, 6, 139, 28643 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
COMMENTS
Arrangements in A288559 that are connected, in the sense that the union of the (boundaries of the) 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.
LINKS
CROSSREFS
Sequence in context: A155558 A053467 A288557 * A090944 A007340 A335318
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jun 13 2017, based on information supplied by Jon Wild on Aug 31 2016
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)