|
|
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
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|