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A129056
Number of n-node triangulations of the nonorientable surface N_4 in which every node has degree >= 6.
0
0, 34, 3864, 87396, 818072, 4611407, 18933909
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: A069223 A258499 A218718 * A212034 A297072 A232900
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 13 2007
STATUS
approved