A129048 Number of n-node triangulations of the Klein bottle N_2 in which every node has degree >= 5.

0, 5, 38, 250, 1246, 6043, 27260, 120389, 517897, 2198806, 9219045

Offset

7,2

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=7..17.

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

Crossrefs

Sequence in context: A294053 A345686 A279265 * A279489 A027323 A110079

Adjacent sequences: A129045 A129046 A129047 * A129049 A129050 A129051

Keyword

nonn

Author

N. J. A. Sloane, May 13 2007

Status

approved