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A129048
Number of n-node triangulations of the Klein bottle N_2 in which every node has degree >= 5.
0
0, 5, 38, 250, 1246, 6043, 27260, 120389, 517897, 2198806, 9219045
OFFSET
7,2
REFERENCES
G. Ringel, Wie man die geschlossenen nichtorientierbaren Flaechen in moeglichst wenig Dreiecke zerlegen kann, Math. Ann. 130 (1955), 317-326.
CROSSREFS
Sequence in context: A294053 A345686 A279265 * A279489 A027323 A110079
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved