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A129057 Number of n-node triangulations of the nonorientable surface N_5 in which every node has degree >= 3. 0
0, 2, 7050, 3355250, 473864807 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,2

REFERENCES

G. Ringel, Wie man die geschlossenen nichtorientierbaren Flaechen in moeglichst wenig Dreiecke zerlegen kann, Math. Ann. 130 (1955), 317-326.

LINKS

Table of n, a(n) for n=8..12.

Thom Sulanke, Generating triangulations of surfaces (surftri), (also subpages).

CROSSREFS

Sequence in context: A112720 A129059 A129058 * A201508 A322126 A272241

Adjacent sequences:  A129054 A129055 A129056 * A129058 A129059 A129060

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 13 2007

STATUS

approved

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Last modified October 20 17:28 EDT 2019. Contains 328268 sequences. (Running on oeis4.)