

A316201


Number of selfavoiding 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.


3




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: A119284 A177124 A153704 * A029845 A124972 A161969
Adjacent sequences: A316198 A316199 A316200 * A316202 A316203 A316204


KEYWORD

nonn,more


AUTHOR

Hugo Pfoertner, Jul 07 2018


STATUS

approved



