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!)
A104590 Number of labeled non-planar non-projective-planar toroidal 2-connected K_{3,3}-subdivision-free graphs with n vertices. 1
560, 191520, 42058800, 7864256400, 1407126890400, 257752421166240, 50607986220311520, 10995419195575214400, 2692773804667509763200, 747221542837742897724800, 233698171655650029030743040, 81472765051132560093387934080, 31268587126068905034073041062400 (list; graph; refs; listen; history; text; internal format)
OFFSET
8,1
COMMENTS
By empirical evidence, the terms possess a curious prime factor behavior. E.g. 2^7*3^2*5*7*13*17*19 divides a(19)=81472765051132560093387934080.
LINKS
A. Gagarin, G. Labelle and P. Leroux, Characterization and enumeration of toroidal K_{3,3}-subdivision-free graphs, arXiv:math/0411356 [math.CO], 2004.
CROSSREFS
Cf. A104591.
Sequence in context: A013487 A229389 A167822 * A259211 A265261 A234936
KEYWORD
nonn
AUTHOR
Valery A. Liskovets, Mar 22 2005
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 02:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)