%I
%S 1,5,67,3000
%N The number of symmetric polyomino tilings of n X n square.
%C The sequence gives the number of distinct tilings by polyominoes of a square with side n, considering tilings that have at least one symmetry. As for "free" polyominoes, tilings that are reflections or rotations of each other are not considered distinct.
%H John Mason, <a href="/A291807/a291807_1.pdf">Example symmetric tilings</a>
%Y Cf. A268416 (polyominoes that will fit in nsided square), A291806 (polyomino tilings of square), A291808 (tilings with distinct polyominoes), A291809 (tilings with differently sized polyominoes).
%K nonn,more
%O 1,2
%A _John Mason_, Sep 01 2017
