A288567 Number of connected arrangements of n circles in the affine plane, in the sense that the union of the boundaries of the circles is a connected set and every circle intersects all the other circles.

1, 1, 1, 3, 21, 980

Offset: 0

Author

N. J. A. Sloane, Jun 13 2017, based on information supplied by Jon Wild

Keywords

• nonn
• more

Comments

These counts have been reduced for mirror symmetry.

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

Crossrefs

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