A288554 Number of arrangements of n circles in the affine plane with the property that every circle intersects all the other circles.

1, 1, 1, 4, 45, 5102

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.

David O. H. Cutler, Jonas Karlsson, and Neil J. A. Sloane, Cutting a Pancake with an Exotic Knife, arXiv:2511.15864[math.CO], v3, April 19 2026.

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 A349866 A222899

Adjacent sequences: A288551 A288552 A288553 * A288555 A288556 A288557

Keyword

nonn,more,hard

Author

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

Status

approved