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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. 4
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

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Last modified January 19 00:40 EST 2020. Contains 331030 sequences. (Running on oeis4.)