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A129053
Number of n-node triangulations of the nonorientable surface N_4 in which every node has degree >= 3.
0
0, 37, 13657, 1628504, 99694693, 4076362798, 127322830218
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: A193158 A202794 A129054 * A324256 A096349 A015061
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved