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A288554 Number of arrangements of n circles in the affine plane with the property that every circle intersects all the other circles. 23
1, 1, 1, 4, 45, 5102 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

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

LINKS

Table of n, a(n) for n=0..5.

Jon Wild, Figure showing relationship between A250001, A275923, A275924, and A288554 for n=3 circles

CROSSREFS

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

Sequence in context: A102894 A132552 A189273 * A288562 A222899 A119729

Adjacent sequences:  A288551 A288552 A288553 * A288555 A288556 A288557

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 12 2017, based on information supplied by Jon Wild on Aug 31 2016.

STATUS

approved

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Last modified February 24 18:24 EST 2018. Contains 299628 sequences. (Running on oeis4.)