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A129047 Number of n-node triangulations of the Klein bottle N_2 in which every node has degree >= 4. 0
0, 6, 133, 1971, 23541, 245261, 2326207, 20685641, 175544819, 1438903377, 11485167375 (list; graph; refs; listen; history; text; internal format)
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: A015503 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

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Last modified March 7 13:24 EST 2021. Contains 341886 sequences. (Running on oeis4.)