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A129030
Number of n-node triangulations of the torus S_1 in which every node has degree >= 3.
0
0, 1, 7, 112, 2109, 37867, 605496, 8778329, 117839254, 1491505713, 18035839188, 210391127053
OFFSET
6,3
REFERENCES
M. Jungerman and G. Ringel, Minimal triangulations on orientable surfaces, Acta Math. 145 (1980), 121-154.
CROSSREFS
Sequence in context: A212702 A217223 A067404 * A128576 A147631 A371330
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 12 2007
STATUS
approved