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A323276
Number of 4-regular maps on the Klein bottle with n vertices and 2n edges.
1
0, 4, 68, 964, 12836, 165784, 2103788, 26396416, 328621604, 4068021916, 50142879128
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A247735 A221336 A339787 * A141032 A156084 A362730
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jan 11 2019
STATUS
approved