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A104590 Number of labeled non-planar non-projective-planar toroidal 2-connected K_{3,3}-subdivision-free graphs with n vertices. 1

%I

%S 560,191520,42058800,7864256400,1407126890400,257752421166240,

%T 50607986220311520,10995419195575214400,2692773804667509763200,

%U 747221542837742897724800,233698171655650029030743040,81472765051132560093387934080,31268587126068905034073041062400

%N Number of labeled non-planar non-projective-planar toroidal 2-connected K_{3,3}-subdivision-free graphs with n vertices.

%C 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.

%H A. Gagarin, G. Labelle and P. Leroux, <a href="https://arxiv.org/abs/math/0411356">Characterization and enumeration of toroidal K_{3,3}-subdivision-free graphs</a>, arXiv:math/0411356 [math.CO], 2004.

%Y Cf. A104591.

%K nonn

%O 8,1

%A _Valery A. Liskovets_, Mar 22 2005

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Last modified September 18 15:58 EDT 2021. Contains 347527 sequences. (Running on oeis4.)