A288556 - OEIS

A288556

Number of connected one-sided arrangements of n circles in the affine plane, in the sense that the union of the solid circles is a connected set.

%I #11 Jun 13 2017 13:03:47

%S 1,1,2,11,183

%N Number of connected one-sided arrangements of n circles in the affine plane, in the sense that the union of the solid circles is a connected set.

%C These counts are not reduced for mirror symmetry.

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

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

%K nonn,more

%O 0,3

%A _N. J. A. Sloane_, Jun 13 2017, based on information supplied by _Jon Wild_.