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A129050
Number of n-node triangulations of the nonorientable surface N_3 in which every node has degree >= 4.
0
0, 133, 9385, 298323, 6162345, 97905411, 1308857389, 15516720575, 168565283562, 1714609792914
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: A262121 A254684 A133240 * A129049 A281496 A015264
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved