A129047 Number of n-node triangulations of the Klein bottle N_2 in which every node has degree >= 4.

0, 6, 133, 1971, 23541, 245261, 2326207, 20685641, 175544819, 1438903377, 11485167375

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: A350611 A247012 A003373 * A209276 A244745 A179564

Adjacent sequences: A129044 A129045 A129046 * A129048 A129049 A129050

Keyword

nonn

Author

N. J. A. Sloane, May 13 2007

Status

approved