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A129051
Number of n-node triangulations of the nonorientable surface N_3 in which every node has degree >= 5.
0
0, 111, 4523, 74307, 777348, 6255683, 42769083, 262073923
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: A302956 A232080 A332914 * A012039 A286117 A286083
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved