A316201 Number of self-avoiding polygons with perimeter 2*n and sides = 1 that have vertex angles from the set +-Pi/11, +-3*Pi/11, +-5*Pi/11, +-7*Pi/11, +-9*Pi/11, not counting rotations and reflections as distinct.

0, 0, 8, 19, 720, 10578

Offset

1,3

Comments

Holes are excluded, i.e., the boundary path may nowhere touch or intersect itself.

Links

Table of n, a(n) for n=1..6.

Contest Organizers, Al Zimmermann's Programming Contests - Snakes on a Plane, Fall 2006.

Hugo Pfoertner, Illustration of polygons of perimeter <= 10.

Crossrefs

Cf. A258206, A266549, A284869, A306181, A316192, A316195, A316197, A316198, A316199, A316200.

Sequence in context: A177124 A153704 A344052 * A029845 A124972 A161969

Adjacent sequences: A316198 A316199 A316200 * A316202 A316203 A316204

Keyword

nonn,more

Author

Hugo Pfoertner, Jul 07 2018

Status

approved