login
A316194
Number of symmetric self-avoiding polygons on square lattice with perimeter 2*n, not counting rotations and reflections as distinct.
7
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.
CROSSREFS
KEYWORD
nonn,walk,more
AUTHOR
Hugo Pfoertner, Jun 27 2018
STATUS
approved