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A129044
Number of n-node triangulations of the projective plane N_1 in which every node has degree >= 4.
0
0, 1, 2, 8, 36, 185, 1050, 6421, 40623, 261828, 1701370, 11098331, 72534862, 474641785
OFFSET
5,3
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: A316663 A243948 A001540 * A052582 A367920 A222468
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 12 2007
STATUS
approved