A129052 Number of n-node triangulations of the nonorientable surface N_3 in which every node has degree >= 6.

0, 23, 190, 758, 2037, 4574, 8929, 16026

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..15.

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

Crossrefs

Sequence in context: A125360 A126518 A167467 * A201859 A232150 A269086

Adjacent sequences: A129049 A129050 A129051 * A129053 A129054 A129055

Keyword

nonn

Author

N. J. A. Sloane, May 13 2007

Status

approved