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A304932
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The number of flat-foldable single vertex crease patterns with unit angle Pi/n.
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2
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1, 2, 6, 20, 87, 420, 2254, 12676, 73819, 438795, 2649555, 16188915, 99888892, 621428188, 3893646748, 24548337096, 155622071065, 991375878185, 6343073841027
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..19.
K. Ouchi and R. Uehara, Efficient Enumeration of Flat-Foldable Single Vertex Crease Patterns, In WALCOM: Algorithms and Computation. WALCOM 2017. Lecture Notes in Computer Science, vol 10167 (pp. 19-29), 2017, Springer, Cham. Gives incorrect a(12).
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CROSSREFS
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Cf. A293031.
Sequence in context: A089179 A177483 A004104 * A293032 A241497 A003069
Adjacent sequences: A304929 A304930 A304931 * A304933 A304934 A304935
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KEYWORD
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nonn,more
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AUTHOR
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Koji Ouchi, May 21 2018
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STATUS
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approved
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