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A288561 Number of connected 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, 6, 112, 15528 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

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 been reduced for mirror symmetry.

See A250001, the main entry for this problem, for further information.

LINKS

Table of n, a(n) for n=0..4.

CROSSREFS

Cf. A250001, A275923, A275924, A288554-A288568.

Sequence in context: A341478 A088668 A275924 * A291917 A066931 A324669

Adjacent sequences:  A288558 A288559 A288560 * A288562 A288563 A288564

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 June 25 01:52 EDT 2021. Contains 345445 sequences. (Running on oeis4.)