A292405 Number of 3-regular maps with 2n vertices on the torus, up to orientation-preserving and orientation-reversing isomorphisms.
1, 5, 40, 450, 6370, 104498, 1843324, 33778574, 632053347, 11983323029, 229304019611, 4419024507187, 85653324334312, 1668284177327594, 32629561950146399
Offset: 1
Links
- E. Krasko, A. Omelchenko, Enumeration of r-regular Maps on the Torus. Part II: Enumeration of Unsensed Maps, arXiv preprint arXiv:1709.03230 [math.CO], 2017.
- E. Krasko, A. Omelchenko, Enumeration of r-regular maps on the torus. Part II: Unsensed maps, Discrete Mathematics, Volume 342, Issue 2, February 2019, pp. 600-614.