A129043 Number of n-node triangulations of the projective plane N_1 in which every node has degree >= 3.

0, 1, 3, 16, 134, 1210, 11719, 114478, 1108826, 10606795, 100352404, 940956644, 8762227629, 81168427279, 748953936818

Offset

5,3

Links

Table of n, a(n) for n=5..19.

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).

Thom Sulanke, Generating maps on surfaces, arXiv:1509.06412 [math.CO], (21-September-2015)

Crossrefs

Sequence in context: A213357 A119392 A307979 * A182951 A247770 A357088

Adjacent sequences: A129040 A129041 A129042 * A129044 A129045 A129046

Keyword

nonn,more

Author

N. J. A. Sloane, May 12 2007

Status

approved