A129045 Number of n-node triangulations of the projective plane N_1 in which every node has degree >= 5.

0, 1, 0, 1, 1, 3, 7, 16, 44, 134, 433, 1483, 5196, 18795, 68845

Offset

5,6

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..19.

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

Crossrefs

Sequence in context: A144977 A058300 A000674 * A217358 A323692 A360782

Adjacent sequences: A129042 A129043 A129044 * A129046 A129047 A129048

Keyword

nonn

Author

N. J. A. Sloane, May 13 2007

Status

approved