A316197 Number of self-avoiding polygons with perimeter 2*n and sides = 1 that have vertex angles from the set +-Pi/7, +-3*Pi/7, +-5*Pi/7, not counting rotations and reflections as distinct.

0, 0, 3, 4, 83, 533, 8329

Offset

1,3

Links

Table of n, a(n) for n=1..7.

Contest Organizers, Al Zimmermann's Programming Contests - Snakes on a Plane, Fall 2006.

Hugo Pfoertner, Illustration of polygons of perimeter <= 12.

Crossrefs

Cf. A306177, A258206, A266549, A284869, A316195.

Sequence in context: A279935 A111799 A135237 * A041253 A297119 A156182

Adjacent sequences: A316194 A316195 A316196 * A316198 A316199 A316200

Keyword

nonn,walk,more

Author

Hugo Pfoertner, Jun 28 2018

Status

approved