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A316198 Number of self-avoiding polygons with perimeter 2*n and sides = 1 that have vertex angles from the set 0, +-Pi/4, +-Pi/2, +-3*Pi/4, not counting rotations and reflections as distinct. 6
0, 2, 6, 59, 695, 12198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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. A306178, A316195, A316197.

Sequence in context: A209459 A209521 A132525 * A074167 A083787 A138286

Adjacent sequences:  A316195 A316196 A316197 * A316199 A316200 A316201

KEYWORD

nonn,walk,more

AUTHOR

Hugo Pfoertner, Jul 04 2018

STATUS

approved

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Last modified June 20 00:47 EDT 2019. Contains 324223 sequences. (Running on oeis4.)