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A129055
Number of n-node triangulations of the nonorientable surface N_4 in which every node has degree >= 5.
0
0, 37, 10845, 735766, 20568278, 341762288, 4088768693
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: A219001 A212945 A220811 * A193158 A202794 A129054
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved