A281346 Related to enumeration of sets of non-intersecting circles in the plane.

1, 1, 4, 11, 41, 141, 537, 2041, 8042, 32028, 129780, 531331, 2198502, 9171233, 38545677, 163031436, 693470737, 2964491394, 12729640115, 54881425222, 237471970199, 1030935383055, 4489081879021, 19601108680782, 85803380983100, 376481393024385, 1655473716162471

Offset

0,3

Comments

Needs a more precise definition.

Links

Table of n, a(n) for n=0..26.

R. J. Mathar, Topologically Distinct Sets of Non-intersecting Circles in the Plane, arXiv:1603.00077 [math.CO], 2016. See (102).

Crossrefs

Sequence in context: A121096 A047091 A121092 * A030981 A151455 A149269

Adjacent sequences: A281343 A281344 A281345 * A281347 A281348 A281349

Keyword

nonn

Author

N. J. A. Sloane, Jan 20 2017

Status

approved