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

0,2

Links

Table of n, a(n) for n=0..10.

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.

Crossrefs

Sequence in context: A247735 A221336 A339787 * A141032 A156084 A362730

Adjacent sequences: A323273 A323274 A323275 * A323277 A323278 A323279

Keyword

nonn,more

Author

N. J. A. Sloane, Jan 11 2019

Status

approved