A323276 Number of 4-regular maps on the Klein bottle with n vertices and 2n edges.
0, 4, 68, 964, 12836, 165784, 2103788, 26396416, 328621604, 4068021916, 50142879128
Offset: 0
Links
- Evgeniy Krasko, Alexander Omelchenko, Enumeration of r-regular maps on the torus. Part I: Rooted maps on the torus, the projective plane and the Klein bottle. Sensed maps on the torus, Discrete Mathematics (2019) Vol. 342, Issue 2, 584-599. Also arXiv:1709.03225 [math.CO]. See Th. 2.3 and Table 3.