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A129059
Number of n-node triangulations of the nonorientable surface N_5 in which every node has degree >= 5.
0
0, 2, 6945, 2619076, 225843445
OFFSET
8,2
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: A330901 A285693 A112720 * A129058 A129057 A201508
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved