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A288560 Number of connected 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, 156, 16782 (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 solid 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..5.

CROSSREFS

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

Sequence in context: A245054 A058154 A275923 * A318173 A349639 A067968

Adjacent sequences:  A288557 A288558 A288559 * A288561 A288562 A288563

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 November 27 20:46 EST 2021. Contains 349395 sequences. (Running on oeis4.)