A275924 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.

1, 1, 1, 6, 112, 15502

Offset: 0

Author

N. J. A. Sloane, Aug 29 2016, based on information supplied by Jon Wild

Keywords

• nonn
• more

Comments

Arrangements in A250001 that are connected, in the sense that the union of the (boundaries of the) circles is a connected set. See A250001, the main entry for this problem, for further information.

Links

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

Crossrefs

Cf. A250001, A275923, A288554-A288568.

Extensions

a(5) corrected by Jon Wild, Aug 31 2016