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A060049
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Triangulations of an n-gon such that each internal vertex has valence at least 6, i.e. nonpositively curved triangulations.
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1
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0, 1, 1, 2, 5, 15, 50, 181, 697, 2821, 11892, 51874, 232974, 1073070, 5053029, 24264565, 118570292, 588567257, 2963358162, 15114174106, 78004013763, 406971280545, 2144659072330, 11407141925639, 61197287846831
(list; graph; refs; listen; history; internal format)
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