A129057 Number of n-node triangulations of the nonorientable surface N_5 in which every node has degree >= 3.

0, 2, 7050, 3355250, 473864807

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