A316194 Number of symmetric self-avoiding polygons on square lattice with perimeter 2*n, not counting rotations and reflections as distinct.

0, 1, 1, 3, 4, 16, 23, 87

Offset

1,4

Comments

The sequence includes polygons of 2-fold, i.e., mirror or rotational, and higher (order >= 4) symmetry.

Links

Table of n, a(n) for n=1..8.

Hugo Pfoertner, Illustration of polygons of perimeter <= 16.

Crossrefs

Cf. A002931, A266549, A316196, A323188, A323189.

Sequence in context: A047164 A304988 A108653 * A123773 A290433 A251582

Adjacent sequences: A316191 A316192 A316193 * A316195 A316196 A316197

Keyword

nonn,walk,more

Author

Hugo Pfoertner, Jun 27 2018

Status

approved