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A129054
Number of n-node triangulations of the nonorientable surface N_4 in which every node has degree >= 4.
0
0, 37, 13067, 1314000, 61111294, 1787036930, 38628806361
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: A129055 A193158 A202794 * A129053 A324256 A096349
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved