A129061 Number of n-node triangulations of the nonorientable surface N_5 in which every node has degree >= 7.

0, 2, 1679, 41336, 195779

Offset

8,2

Links

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

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

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

Crossrefs

Sequence in context: A002490 A179961 A160224 * A233132 A277389 A011541

Adjacent sequences: A129058 A129059 A129060 * A129062 A129063 A129064

Keyword

nonn,more

Author

N. J. A. Sloane, May 13 2007

Status

approved