login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A281345 Related to enumeration of sets of non-intersecting circles in the plane. 0
1, 2, 8, 26, 99, 364, 1417, 5541, 22193, 89799, 368160, 1523020, 6355895, 26713307, 112999390, 480666202, 2054863538, 8823764846, 38042350806, 164609190230, 714613926565, 3111673137244, 13586653421083, 59474496929094, 260953934483595, 1147456294303011, 5055688301028252, 22317001824137254 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Needs a more precise definition.

LINKS

Table of n, a(n) for n=0..27.

R. J. Mathar, Topologically Distinct Sets of Non-intersecting Circles in the Plane, arXiv:1603.00077 [math.CO], 2016. See (101).

CROSSREFS

Sequence in context: A067855 A301699 A129368 * A348240 A128238 A110156

Adjacent sequences:  A281342 A281343 A281344 * A281346 A281347 A281348

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 20 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)