A339266 Numbers of connected arrangements of n equal circles in the affine plane, in the sense that the union of the boundaries of the circles is a connected set.

1, 1, 1, 4, 29

Offset

0,4

Links

Table of n, a(n) for n=0..4.

Ya-Ping Lu, Configurations for a(1) through a(4)

Jon Wild, Illustrations of the 173 configurations of four circles

Example

Configurations for a(1) through a(4) are given in the links.

Crossrefs

Cf. A250001, A275923, A275924, A288554-A288568, A296407

Sequence in context: A129290 A307553 A327436 * A247278 A278823 A042597

Adjacent sequences: A339263 A339264 A339265 * A339267 A339268 A339269

Keyword

nonn,more

Author

Ya-Ping Lu, Nov 29 2020

Status

approved