A319115 Number of simple connected toroidal graphs on n nodes.

0, 0, 0, 0, 1, 13, 207, 5128

Offset: 1

Author

Eric W. Weisstein, Sep 10 2018

Keywords

• nonn
• more

Comments

a(n) <= A145270(n).

a(n) = A145270(n) for n < 8.

a(8) = A145270(8) - 15 since there are 15 double-toroidal graphs on 8 nodes, all of which are connected.

Links

• Eric Weisstein's World of Mathematics, Connected Graph
• Eric Weisstein's World of Mathematics, Simple Graph
• Eric Weisstein's World of Mathematics, Toroidal Graph

Crossrefs

Cf. A145270 (simple connected nonplanar graphs).