A316199 - OEIS

A316199

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

0, 0, 8, 17, 472, 7042

(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 <= 12.

CROSSREFS

Cf. A306179, A316195, A316197, A316198.

Sequence in context: A041126 A248289 A176823 * A300905 A008664 A107779

Adjacent sequences: A316196 A316197 A316198 * A316200 A316201 A316202

KEYWORD

nonn,walk,more

AUTHOR

Hugo Pfoertner, Jul 04 2018

STATUS

approved