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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. 3
0, 0, 8, 19, 720, 10578 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 16 03:55 EST 2019. Contains 319184 sequences. (Running on oeis4.)