A129044 Number of n-node triangulations of the projective plane N_1 in which every node has degree >= 4.

0, 1, 2, 8, 36, 185, 1050, 6421, 40623, 261828, 1701370, 11098331, 72534862, 474641785

Offset

5,3

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=5..18.

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

Crossrefs

Sequence in context: A316663 A243948 A001540 * A052582 A367920 A222468

Adjacent sequences: A129041 A129042 A129043 * A129045 A129046 A129047

Keyword

nonn

Author

N. J. A. Sloane, May 12 2007

Status

approved