A129058 Number of n-node triangulations of the nonorientable surface N_5 in which every node has degree >= 4.

0, 2, 7044, 3175312, 382274854

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: A285693 A112720 A129059 * A129057 A201508 A322126

Adjacent sequences: A129055 A129056 A129057 * A129059 A129060 A129061

Keyword

nonn

Author

N. J. A. Sloane, May 13 2007

Status

approved