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Number of n-node triangulations of the projective plane N_1 in which every node has degree >= 5.
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%I #3 Mar 30 2012 16:50:41

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

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

%D G. Ringel, Wie man die geschlossenen nichtorientierbaren Flaechen in moeglichst wenig Dreiecke zerlegen kann, Math. Ann. 130 (1955), 317-326.

%H Thom Sulanke, <a href="http://hep.physics.indiana.edu/~tsulanke/graphs/surftri/">Generating triangulations of surfaces (surftri)</a>, (also subpages).

%K nonn

%O 5,6

%A _N. J. A. Sloane_, May 13 2007