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

0,4

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

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, A288554-A288568.

Sequence in context: A009798 A341478 A088668 * A288561 A291917 A066931

Adjacent sequences: A275921 A275922 A275923 * A275925 A275926 A275927

Keyword

nonn,more

Author

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

Extensions

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

Status

approved