A304932 The number of flat-foldable single vertex crease patterns with unit angle Pi/n.

1, 2, 6, 20, 87, 420, 2254, 12676, 73819, 438795, 2649555, 16188915, 99888892, 621428188, 3893646748, 24548337096, 155622071065, 991375878185, 6343073841027

Offset

1,2

Links

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).

Crossrefs

Cf. A293031.

Sequence in context: A089179 A177483 A004104 * A293032 A241497 A003069

Adjacent sequences: A304929 A304930 A304931 * A304933 A304934 A304935

Keyword

nonn,more

Author

Koji Ouchi, May 21 2018

Status

approved